Huan jing ke xue= Huanjing kexue最新文献

{"title":"[Spatiotemporal Characteristics of Dissolved Oxygen and Control Mechanism of Hypoxia (Low Oxygen) in the Watershed-Coastal System in Fujian Province].","authors":"Ai-Lin Yang,&nbsp;Fang Yang,&nbsp;Shao-Bin Li,&nbsp;Qi-Biao Yu,&nbsp;Neng-Wang Chen","doi":"10.13227/j.hjkx.202206033","DOIUrl":"https://doi.org/10.13227/j.hjkx.202206033","url":null,"abstract":"<p><p>Dissolved oxygen is a key parameter to measure water environment quality and ecosystem health. Currently, the problem of hypoxia (low oxygen) is prominent in coastal areas in China, but there is a lack of research on the spatiotemporal characteristics of dissolved oxygen and the control mechanism of hypoxia in the watershed-coastal system. Based on the data of 135 surface water (including estuaries) and 66 coastal water monitoring sites in Fujian Province from 2011 to 2020, this study analyzed the spatiotemporal variation pattern of dissolved oxygen at seasonal and interannual time scales. The data of hypoxia (10% quantile, corresponding to 67% saturation) were selected to study the characteristics and control mechanism of hypoxia in four types of water bodies (i.e., rivers, reservoirs, estuaries, and coastal waters) using mathematical statistics and a random forest model. The results showed that the dissolved oxygen saturation was the highest in the coast[(98.2±10.2)%] and the lowest in the estuary[(79.2±17.9)%]. Compared with that in the 12^th Five-Year Plan (2011-2015), the frequency of hypoxia detection in rivers and reservoirs in the 13^th Five-Year Plan (2016-2020) was significantly reduced, but the change in estuaries was not significant. Counting the points with hypoxia detection, the multi-year average hypoxia detection frequency of rivers and reservoirs was highest in autumn, and the frequency of estuaries was highest in summer. Hypoxia in reservoirs and estuaries was the most prominent but with different mechanisms. Specifically, hypoxia in reservoir reaches was related to summer runoff carrying large amounts of organic matter input, stratification leading to continuous oxygen depletion in the bottom water, and vertical mixing or discharge through dams in autumn, whereas hypoxia in estuaries was associated with strong pollution inputs and reductive materials. Systematic management and regionalized control mechanisms need to be established to further strengthen watershed-coastal pollution abatement to help mitigate eutrophication and hypoxia problems.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"4950-4960"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40722521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Distribution, Migration, and Transformation Mechanism of Labile Phosphorus in Sediments of Xixi River Estuary, Xiamen].","authors":"Feng Pan,&nbsp;Yu Cai,&nbsp;Zhan-Rong Guo,&nbsp;Xin-Hong Wang","doi":"10.13227/j.hjkx.202206016","DOIUrl":"https://doi.org/10.13227/j.hjkx.202206016","url":null,"abstract":"<p><p>To explore the effect of manganese, iron, and sulfur geochemistry on the distribution of labile phosphorus in different estuarine areas, the diffusion gradient in thin-film (DGT) sampling technique was used for in-situ high-resolution monitoring of available phosphorus (DGT-P), manganese, iron, and sulfur in sediments from Xixi River estuary in Xiamen. The results showed that the distribution of DGT-P in the vertical profile was closely related to the redox transformation of iron and sulfur and the background value of active phosphorus in sediments. The passivation/activation of phosphorus was mainly controlled by the oxidative adsorption/reductive dissolution of phosphorus by iron oxides and the activation of phosphorus induced by sulfate reduction and sulfide accumulation. Along the sampling sites, the average concentration of DGT-P varied greatly (0.075-0.80 mg·L^-1), which was not related to salinity but closely related to redox conditions, that is, the deeper the oxidation zone, the lower the average concentration of DGT-P. The simulation results showed that the phosphorus resupply capacity from surface sediments to porewater was correlated with DGT-P concentration and redox conditions, that is, the oxidative environment was unconducive to the desorption and resupply of sediment phosphorus, whereas the coupling with iron and sulfur geochemistry in the reducing environment was conducive to the maintenance of high labile phosphorus concentration and the continuous release of phosphorus.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"4961-4970"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40722522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effects of Oyster Shell Powder and Lime on Availability and Forms of Phosphorus and Enzyme Activity in Acidic Paddy Soil].","authors":"Li-Fang Zhao,&nbsp;Peng-Wu Huang,&nbsp;Cai-di Yang,&nbsp;Sheng-Gao Lu","doi":"10.13227/j.hjkx.202201176","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201176","url":null,"abstract":"<p><p>Soil acidification improvement in the main grain production regions of southern China is an important issue to enhance the quality of cultivated land and promote grain yield. In order to explore the effects of oyster shell powder and lime on acidity and availability and inorganic forms of phosphorus in acidic paddy soil, a pot experiment was performed using oyster shell powder and lime amendments with dosages of 0.05%, 0.10%, and 0.15%. The results showed that both oyster shell powder and lime significantly (<i>P</i><0.05) increased the pH and decreased exchangeable acid content of paddy soil. The improvement effects increased with the dosage of soil amendments. Under the same amendment dosage, the effects of lime on soil pH and acidity were higher than those of oyster shell powder. Both lime and oyster shell powder significantly increased the content of available P extracted using H₂SO₄-P, Bray-1 P, and Olsen-P techniques. The contents of inorganic P in soils decreased in the order of Fe-P>Al-P>Ca-P. The application of lime and oyster shell powder significantly increased the contents of Al-P and Fe-P in soil. Compared with the control treatment, lime and oyster shell power increased Al-P and Fe-P by 26.3%-37.4% and 7.9%-23.7%, respectively. However, there was no significant difference in Al-P content among treatments of the three amendment dosages. The contents of Fe-P and Ca-P in soils increased with an increased dosage of amendments. The activities of DHA, ALP, and IPP and the copy number of the <i>phoD</i> gene in soil increased with the application of lime and oyster shell powder, whereas the activities of ACP and the copy numbers of <i>phoC</i> and <i>pqqC</i> decreased. The application of lime and oyster shell powder at a rate of 0.10% and 0.15% significantly (<i>P</i><0.05) increased the yield of rice. The lime and oyster shell powder treatments at the dosage of 0.15% increased rice yield by 34.2% and 46.8%, respectively, whereas the amendment had no significant effect on straw biomass of the rice crop. Correlation analysis showed that soil pH and the ALP activity were significantly positively correlated with inorganic P and available P contents, respectively. These results suggested that lime and oyster shell power could effectively increase the content of available phosphorus by eliminating soil acidity and improving the phosphatase activity, which played a positive role in increasing crop yield.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"5224-5233"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40487595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Mechanism and Environmental Effect on Nitrogen Addition to Microbial Process of Arsenic Immobilization in Flooding Paddy Soils].","authors":"Feng Wang,&nbsp;Jing Zhang,&nbsp;Shao-Yu Zhou,&nbsp;Hong-Hui Wang,&nbsp;Jian Li,&nbsp;Cong-Yuan Zhao,&nbsp;Peng Huang,&nbsp;Zheng Chen","doi":"10.13227/j.hjkx.202205292","DOIUrl":"https://doi.org/10.13227/j.hjkx.202205292","url":null,"abstract":"<p><p>China is one of the largest rice producers in the world, and rice production plays an important role in food security. Currently, arsenic pollution in paddy soils is one of most serious soil pollutions in China. Since paddy soils are maintained in a flooding anoxic condition for long periods, the rate and extent of arsenic transformation processes governed by microbial activities are stronger than that of chemical processes. Thus, understanding the key processes and relating mechanisms of microbial arsenic fixation in paddy soils will provide a theoretical basis for controlling arsenic pollution in paddy soils. In this study, based on a comprehensive analysis of arsenic migration in paddy soils and relating influencing factors, two important pathways relating to As(Ⅲ) fixation through microbial activities were illustrated:microbial ČFe(Ⅱ) oxidation coupled with As(Ⅲ) fixation (indirect process) and direct fixation through microbial As(Ⅲ) oxidation (direct process). Additionally, the influences of speciation and the distribution of nitrogen in paddy soils to the processes of microbial arsenic fixations were discussed and by extension, the expressions of key genes and metabolic mechanisms relating to microbial arsenic fixation and nitrogen transformation. Finally, the recent advances in microbial remediation used to control arsenic pollution in paddy soils were summarized, and relating future perspectives targeting microbial remediation were proposed.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"4876-4887"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40707850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Advances in On-site Analytical Methods for Inorganic Arsenic in Environmental Water].","authors":"Guang-Yong Bo,&nbsp;Zhao-Ying Chen,&nbsp;Zhen-Bin Gong,&nbsp;Jian Ma","doi":"10.13227/j.hjkx.202206023","DOIUrl":"https://doi.org/10.13227/j.hjkx.202206023","url":null,"abstract":"<p><p>Arsenic is a ubiquitous metalloid element in the environment. Arsenic is classified as a group A carcinogen and has caused serious impacts on human health. For example, chronic poisoning caused by arsenic in groundwater is a global health problem. The forms of arsenic in environmental water are diverse, which can easily be transformed into each other during the sampling process and transportation, resulting in errors in laboratory analysis results. Therefore, developing on-site analytical methods for arsenic and acquiring accurate data are the basis for the study of the morphological transformation and bio-absorption process of arsenic and accurately evaluating its toxicity. In the past few decades, laboratory-based analytical methods for arsenic have developed rapidly, but there are still huge challenges in the on-site analysis of arsenic. This review summarized the relevant reviews on analytical methods of arsenic in environmental water in the past decade (2011-2022); discussed the advances in on-site analytical methods such as colorimetric methods, luminescence-based methods, and electrochemical methods of arsenic; anticipated the future development of on-site analytical methods for arsenic in environmental waters; and provided references for the development and applications of new methods.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"4845-4857"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40707904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effect of Nitrogen Addition on Soil Fungal Diversity in a Degraded Alpine Meadow at Different Slopes].","authors":"Xiao-Xue Su,&nbsp;Xi-Lai Li,&nbsp;Cheng-Yi Li,&nbsp;Hua-Fang Sun","doi":"10.13227/j.hjkx.202201259","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201259","url":null,"abstract":"<p><p>This study proposed nitrogen addition experiments to analyze the effects of exogenous nitrogen addition on soil fungal diversity in alpine meadow. All the experiments were performed in degraded alpine meadow with two different slopes (gentle slope and steep slope) in Guoluo Prefecture of the Sanjiangyuan Region, and the sequence and analysis of ITS of soil fungi were performed using MiSeq PE250 sequencing technology. Comparative analysis was carried out with three nitrogen addition levels on soil fungal diversity in degraded grassland with different slopes, which included low nitrogen (LN, 2 g·m^-2), middle nitrogen (MN, 5 g·m^-2), and high nitrogen (HN, 10 g·m^-2). The results showed that:① the distribution groups of fungi in the soil were Ascomycota, Basidiomycota, Mortierellomycota, and Glomomycota, and the dominant bacteria was Ascomycota. ② The dominant genera were <i>Mortierella</i> and <i>Archaeorhizomyces</i>, and there were no differences in response to different slopes and nitrogen addition levels. ③ A total of 95 genera (<i>Gibberellum</i>, <i>Preussia</i>, etc.) were identified and significantly differed between two different slopes (<i>P</i><0.05). ④ Bacteria with a relative abundance less than 1% had significant differences in nitrogen addition at different levels on the same slope (<i>P</i><0.05). 5 In addition, the analyses of <i>α</i> and <i>β</i> diversities showed that soil fungal community structure was stable under different slopes and nitrogen addition levels. Exogenous nitrogen supplementation significantly improved the relative abundance of non-dominant fungal communities without destroying soil fungal community structure.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"5286-5293"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40512793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Characteristics and Potential Sources of Four Ozone Pollution Processes in Hainan Province in Autumn of 2019].","authors":"Chuan-Bo Fu,&nbsp;Hong Chen,&nbsp;Li Dan,&nbsp;Wen-Shuai Xu","doi":"10.13227/j.hjkx.202201225","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201225","url":null,"abstract":"<p><p>Based on the air quality and meteorological monitoring data of Hainan province in autumn of 2019, this study analyzed the characteristics and potential sources for the four O₃ polluted processes in Hainan province, using the methods of correlation analysis, HYSPLIT backward trajectory modeling, PSCF (potential source contribution function), and CWT (concentration weighted-trajectory). The results showed that ① the average concentrations of the maximum 8h average (O₃-8h) for process 1 and process 3, which occurred from September 21^st to 30^th and November 3^rd to 11^th with the durations of 10 d and 9 d, were 145.52 μg·m^-3 and 143.55 μg·m^-3, respectively. Process 2 and process 4 occurred from October 18^th to 21^st and November 20^th to 25^th, with the durations of 4 d and 6 d, and the average concentrations of O₃-8h were 130.79 μg·m^-3 and 115.46 μg·m^-3, respectively. ② High air pressure, low precipitation and relative humidity, long sunshine duration, and strong solar radiation favored the occurrence of O₃-polluted weather in Hainan province. Northerly wind was conducive to the increase in O₃-8h concentration, and wind speeds affected the regional distribution of high-value areas of O₃-8h concentration in Hainan province. ③ Furthermore, process 1 and process 3 with more serious pollution had a larger air flow divergence, and there were two airflows originating from the inland area and the southeast coastal area, respectively. Air flow of process 2 and process 4 was relatively more concentrated with less O₃ pollution and was classified as southeast coastal air flow. 4 The analysis of potential contribution sources showed that transport from Zhejiang, Jiangxi, Fujian, and Guangdong provinces were the main sources of O₃ pollution in Hainan province in autumn 2019. Among them, the weight potential source contribution function (WPSCF) and weight concentration weighted-trajectory (WCWT) values were larger than 0.36 and 90 μg·m^-3 in the PRD (Pearl River Delta) and western Guangdong province regions, respectively.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"5000-5008"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40722526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effect of Aging on Stabilization of Cd²⁺ Through Biochar Use in Alkaline Soil of Bayan Obo Mining Area].","authors":"Zhe Wang,&nbsp;Jun-Li Cheng,&nbsp;Yuan Bian,&nbsp;Chun-Li Zheng,&nbsp;Wei-da Wang,&nbsp;Qing-Hong Jiang","doi":"10.13227/j.hjkx.202201246","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201246","url":null,"abstract":"<p><p>Although biochar has been widely used in the remediation of heavy metal pollution in acidic and neutral soils, less attention has been paid to whether biochar will alter its structural properties and the ability to retain heavy metals after different degrees of aging in alkaline soils. In this study, two artificial accelerated aging methods (freeze-thaw cycle and dry-wet cycle) and a short-term natural aging method were used to simulate the aging process of biochar prepared from corn stalk. We investigated the changes in the soil pH and bioavailability, total content, and transformation of Cd²⁺ before and after aging treatments. Biochar was separated from the soil for characterization to explore the effect of aging on the passivation of Cd²⁺ by biochar in the alkaline soil of the mining area. The results showed that adding biochar to alkaline soil in the Bayan Obo mining area had no significant liming effect, and pH decreased after the freeze-thaw and dry-wet accelerated aging treatments. Compared with that in the control, the CaCl₂-extractable contents of Cd²⁺ decreased by 19.32%-30.67%, and the total contents of Cd²⁺ decreased by 5.02%-7.18%. Aging did not significantly change the transformation of Cd²⁺ but reduced the distribution of acid-soluble and reducible fractions, indicating that biochar could immobilize Cd²⁺ for a long time after aging, which was related to the increase in oxygen-containing functional groups and the pore structure of biochar. These results are important for evaluating its long-term application prospects in the mining environment.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"5205-5213"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40487593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Adsorption of Mn²⁺ by Modified Biochar Fixed Bed in Simulated Lakes and Reservoir Waters].","authors":"Jie Zhao,&nbsp;Zhi-Long Ye,&nbsp;Jia-Ni Wang,&nbsp;Guan-Jing Cai","doi":"10.13227/j.hjkx.202205315","DOIUrl":"https://doi.org/10.13227/j.hjkx.202205315","url":null,"abstract":"<p><p>Lakes and reservoirs are important water resources for human survival and sustainable development. The seasonal excess of manganese ions (Mn²⁺) in drinking water in lakes and reservoirs has become an important factor threatening human life in health and social safety in production. Firstly, a batch study of NaOH-modified biochar was carried out. The effects of pyrolysis temperature (400, 500, and 600℃) and modification conditions (unmodified, pre-alkali modified, and post-alkali modified) on the adsorption performance of biochar were investigated. The results showed that the alkali pretreatment could improve the adsorption capacity of biochar, and the maximum adsorption capacity of the modified biochar obtained by alkali pretreatment at 400℃ was 41.06 mg·g^-1. Additionally, the dynamic adsorption characteristics of Mn²⁺in the application on the fixed bed were investigated. The results showed that the stronger the adsorption capacity of biochar in the batch experiment, the longer its breakthrough point (<i>c</i>_<i>t</i>/<i>c</i>₀=0.1) and saturation point (<i>c</i>_<i>t</i>/<i>c</i>₀=0.9) in the dynamic adsorption process. In addition, when the initial concentration of Mn²⁺ and the influent flow rate were increased, the breakthrough point of the fixed bed was shortened from 360 min to 160 min and 200 min, respectively, and the saturation point was shortened from 865 min to 700 min and 600 min, respectively. The Thomas model could better fit the adsorption process of the fixed bed, indicating that the removal of Mn²⁺ by biochar was also dominated by chemical adsorption. This outcome can provide theoretical guidance for actual operations.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"4971-4981"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40722523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Research Progress of Analytical Methods with Molecular Spectroscopy for Determination of Trace Nutrients and Metals in Seawaters].","authors":"Dong-Xing Yuan,&nbsp;Yong-Ming Huang,&nbsp;Ting Wang","doi":"10.13227/j.hjkx.202205338","DOIUrl":"https://doi.org/10.13227/j.hjkx.202205338","url":null,"abstract":"<p><p>On-field monitoring is an important way to obtain data in marine environmental research. The ocean environmental conditions are harsh and complex, and there are many difficulties in seawater sample collecting, storing, and transporting. Therefore, the on-field and in-situ detections of chemical parameters have always been pursued by oceanographers and have become a research hot point in the seawater analysis field. In this review, the recent research progress of detection methods with molecular spectroscopy techniques for trace nutrients and metals in seawater was summarized. From the view of sensitivity and detection range, we discussed analytical techniques of trace nutrients (phosphate, nitrate, nitrate, and ammonium) and metals (iron, manganese, copper, and aluminum). It focused on methods of on-field and in-situ measures and development of optical methods such as spectrophotometry, fluorescence, and chemiluminescence, as well as the corresponding instruments that are most suitable in marine field observation. Examples of the application of these methods and relative instruments in land-and ship-based laboratories, ship-board underway monitoring, and long-term in-situ observation were presented. The key problems and possible solutions were analyzed, and the future development of the research field was proposed.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 11","pages":"4822-4834"},"PeriodicalIF":0.0,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40707902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}