Helium Journal of Science and Applied Chemistry最新文献

Comparison of COD Determination Methods FAS Titrimetric with UV-Vis Spectrophotometry FAS滴定法与紫外可见分光光度法测定COD的比较

Helium Journal of Science and Applied Chemistry Pub Date : 2023-09-06 DOI: 10.33751/helium.v3i1.8097

Intan Wulandari, Uswatun Hasanah, Siti Warnasih

{"title":"Comparison of COD Determination Methods FAS Titrimetric with UV-Vis Spectrophotometry","authors":"Intan Wulandari, Uswatun Hasanah, Siti Warnasih","doi":"10.33751/helium.v3i1.8097","DOIUrl":"https://doi.org/10.33751/helium.v3i1.8097","url":null,"abstract":"Liquid waste is one of the factors causing contamination of the aquatic environment. One of the chemical parameters of water quality namely Chemical Oxygen Demand (COD). This research was conducted at three different concentration levels, namely low, medium, and high, with samples of river water, domestic wastewater, and sago liquid waste. The method used is UV-Vis spectrophotometry (SNI 6989.2: 2019) and FAS titrimetry (APHA, 2017 methods 5220 D); for the UV-Vis spectrophotometry method in the range 90 mg/L, the wavelength was measured at 420 nm, while for high levels in the range 100 mg/L x 900 mg/L, it was measured at 600 nm. The quality control parameters used are accuracy and precision parameters. The purpose of this study was to compare the COD determination between UV-vis spectrophotometry and FAS titrimetry and to determine the validity and correlation of the two methods—a comparison of the results of the two methods used in the F test. The results showed that the COD values from UV visible spectrophotometry and FAS titrimetry yielded good precision and accuracy values and met the acceptable limits, namely %RSD 10% and 90% accuracy %R 110%. However, the results of the COD analysis using the UV-Vis spectrophotometry method were lower by 0.8556 than the results of the COD analysis using the FAS titration method, with a correlation coefficient r2 = 0.982. The average concentration of UV-Vis spectrophotometry in samples of sago wastewater was 572.141 mg/L, domestic wastewater was 113.525 mg/L, and river water was 42.98 mg/L. The average COD level of the titrimetric method in sago wastewater was 641.888 mg/L, domestic wastewater was 219.251 mg/L, and river water was 58.016 mg/L. The results of the F test for these two methods produce an Fcount Ftable. The null hypothesis (Ho) is rejected, meaning there is a significant difference between the two methods.","PeriodicalId":495408,"journal":{"name":"Helium Journal of Science and Applied Chemistry","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135205670","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}

引用次数: 0

Potential of Cassava Peel as Cr Metal Biosorbent in Laboratory COD Waste 木薯皮在实验室COD废水中作为金属铬生物吸附剂的潜力

Helium Journal of Science and Applied Chemistry Pub Date : 2023-06-28 DOI: 10.33751/helium.v3i1.7932

Farhan Fatur Rachman, Yulian Syahputri, Sutanto Sutanto

{"title":"Potential of Cassava Peel as Cr Metal Biosorbent in Laboratory COD Waste","authors":"Farhan Fatur Rachman, Yulian Syahputri, Sutanto Sutanto","doi":"10.33751/helium.v3i1.7932","DOIUrl":"https://doi.org/10.33751/helium.v3i1.7932","url":null,"abstract":"Cassava peel is an agricultural residual waste that can be found from industrial processing in Indonesia. Cassava peel contains cellulose which can be used as a biosorbent. The aim of this study was to optimize the adsorption of cassava peel waste on chromium metal ions and then to determine the adsorption capacity and adsorption constant values of the Langmuir model and the Freundlich model. The research was divided into four stages, namely manufacture, optimization conditions, maximum capacity, and application to waste. Optimization conditions for weight ratio, optimum concentration, pH, and contact time. Determination of chromium content, standard series, and testing using the APHA method SSA ed. 23rd 3030 D 3111 B, 2017 at a wavelength of 357.78 nm. Determination of adsorption isotherms of Langmuir and Freundlich models. The optimum condition results at a weight ratio of 1 gram in 10 ml of solution, a concentration of 10 ppm, pH 2, and a contact time of 180 minutes. The adsorption capacity is 0.10216 mg Cr/gram cassava peel biosorbent. Application to chrome contamination laboratory waste obtained an adsorbed concentration of 20.681 ppm. In the Langmuir and Freundlich isothermal model, the R2 value is 0.9668 and 0.9985, the n value is 0.73964.","PeriodicalId":495408,"journal":{"name":"Helium Journal of Science and Applied Chemistry","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135359439","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}

引用次数: 0

Effectiveness Hydroxyapatite from Chicken Eggshells for Adsorption of Chromium (VI) Metal Ion Electroplating Waste 蛋壳羟基磷灰石吸附电镀废渣铬(VI)金属离子的效果

Helium Journal of Science and Applied Chemistry Pub Date : 2023-06-27 DOI: 10.33751/helium.v3i1.7929

Afifah Nur Ismawati, Ani Iryani, Linda Jati Kusumawadani

{"title":"Effectiveness Hydroxyapatite from Chicken Eggshells for Adsorption of Chromium (VI) Metal Ion Electroplating Waste","authors":"Afifah Nur Ismawati, Ani Iryani, Linda Jati Kusumawadani","doi":"10.33751/helium.v3i1.7929","DOIUrl":"https://doi.org/10.33751/helium.v3i1.7929","url":null,"abstract":"The largest source of waste comes from household activities. One of the wastes that comes from household activities is chicken eggshells waste. Chicken eggshells contain 94% CaCO3 and can be used as a source of calcium to synthesize hydroxyapatite (Ca10(PO4)6(OH)2) by the precipitation method. Hydroxyapatite can be used as an adsorbent material because it has pores, inert, and wear-resistant so it can adsorb dissolved metal ions Cr (VI) contained in liquid waste from electroplating process. This research aims to synthesize hydroxyapatite from chicken eggshells and determine the optimum pH, contact time, adsorbent mass, and initial concentration of waste which influence the adsorption efficiency using continuous system column adsorption method with fixed flow rate 25 mL/min. In this study, the metal ions Cr (VI) was chosen as adsorbate because Cr (VI) is the main component in electroplating process. This research started from preparation of chicken eggshells waste then synthesized into hydroxyapatite and characterized using XRD, FTIR, and SEM that known structure formed adsorbent is hydroxyapatite and measuring the initial Cr (VI) concentration in waste using AAS with wavelength 357,9 nm. The result of optimizing are the optimum pH 5, contact time of 60 minutes, 3,5 gram of adsorbent mass, and the initial concentration of waste is 10 ppm. The analyzed were done for Cr (VI) concentration. The result showed 99,48% adsorption efficiency with final concentration of Cr (VI) is 0,07 ppm. The adsorption process followed the Freundlich isotherm model with maximum adsorption capacity of 3,93 mg/g hydroxyapatite.","PeriodicalId":495408,"journal":{"name":"Helium Journal of Science and Applied Chemistry","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135503537","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}

引用次数: 0

Antimicrobial Activity of The Ethanol Extract of Coffea canephora L. Seeds Against Staphylococcus aureus and Propionibacterium acnes 咖啡籽乙醇提取物对金黄色葡萄球菌和痤疮丙酸杆菌的抑菌活性研究

Helium Journal of Science and Applied Chemistry Pub Date : 2023-06-27 DOI: 10.33751/helium.v3i1.7512

Siska Elisahbet Sinaga, Matius Paundanan, Maharani Farah Dhifa Dg Masikki, Diana Widiastuti

{"title":"Antimicrobial Activity of The Ethanol Extract of Coffea canephora L. Seeds Against Staphylococcus aureus and Propionibacterium acnes","authors":"Siska Elisahbet Sinaga, Matius Paundanan, Maharani Farah Dhifa Dg Masikki, Diana Widiastuti","doi":"10.33751/helium.v3i1.7512","DOIUrl":"https://doi.org/10.33751/helium.v3i1.7512","url":null,"abstract":"Acne is a skin disease that causes humans to lack confidence in carrying out activities. Besides being sick, acne worsens the beauty of human skin. The cause of acne is gram-positive bacteria, namely Staphylococcus aureus and Propionibacterium acnes. Many studies reported that Coffea canephora L can inhibit the growth of bacteria. The objective of this study is to establish the minimum inhibitory concentration (MIC) of the ethanol extract of robusta coffee seeds in inhibiting the growth of Staphylococcus aureus and Escherichia coli. The ethanol extract of C. canephora L seed was obtained by maceration method using 96% ethanol. The extract obtained was evaluated for its antibacterial activity using the agar diffusion method with perforation techniques. The extract was divided into five various concentrations (50%, 25%, 12.5%, 6.25%, and 3.125%). The results of this study indicated that the ethanol extract of coffee seeds with a concentration of 50% resulted in a wider diameter of the zone of inhibition of bacterial growth in S. aureus, 30.00 mm compared to P. acnes, 26.22 mm. The MIC of ethanol extract for S. aureus at 3.00% while P. acnes was 6.00%. In conclusion, the antibacterial effect of the ethanol extract of coffee seeds at 50% concentration was stronger against S. aureus bacteria than P. acnes. The greater the concentration of the extract, the wider the resulting inhibition zone.","PeriodicalId":495408,"journal":{"name":"Helium Journal of Science and Applied Chemistry","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135503758","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}

引用次数: 0

Utilization of Tea Waste Activated by Using Hydrochloric Acid as An Adsorbent for Calcium (II) Ions in Hard Water 盐酸活化茶渣对硬水中钙离子的吸附研究

Helium Journal of Science and Applied Chemistry Pub Date : 2023-06-27 DOI: 10.33751/helium.v3i1.7930

Meizaristy Ananta Wuryani, Agus Taufiq, Muhammad Fathurrahman

{"title":"Utilization of Tea Waste Activated by Using Hydrochloric Acid as An Adsorbent for Calcium (II) Ions in Hard Water","authors":"Meizaristy Ananta Wuryani, Agus Taufiq, Muhammad Fathurrahman","doi":"10.33751/helium.v3i1.7930","DOIUrl":"https://doi.org/10.33751/helium.v3i1.7930","url":null,"abstract":"Water is an important natural resource for human survival. Groundwater in calcareous soil areas contains high levels of Ca(HCO3)2 and Mg(HCO3)2 salts and will have a negative impact if consumed continuously. In this study, an adsorption method using tea waste (Camellia sinensis) was conducted to reduce the concentration of Ca(II) ions that cause water hardness. Tea waste was activated with 0.1 N HCl for 24 hours. Tea waste was characterized by Fourier Transform Infrared (FTIR) and Scanning Electron Microscopy (SEM). Determination of optimum conditions was carried out at pH variations of 4, 6, and 8, with contact times of 30 minutes, 60 minutes and 90 minutes, and adsorbent weights were 0,5 grams, 1 gram, 1.5 grams and 2 grams. Tea waste with the best optimum conditions was tested on Ca(II) solutions of various concentrations from 30, 50, and 70 mg/L respectively to determine the maximum capacity for Ca(II) metal ions and the type of adsorption isotherm. Then applied to well water samples analyzed by Inductively Coupled Plasm (ICP) to determine the capacity of Ca(II) that can be absorbed by each adsorbent. The results showed that to utilize 0.1 N HCl-activated tea waste as an adsorbent for Ca(II) metal ions were optimum at pH 8, with a contact time of 30 minutes and an adsorbent weight of 0.5 grams. The maximum adsorption capacity was obtained at Ca(II) solution concentration of 70 mg/L with an adsorption capacity value of 6.704 mg/g. The adsorption isotherm corresponding to the tea waste adsorbent is the Freundlich isotherm (r2 = 0.9199). The highest absorption of Ca(II) metal ions in well water samples from the concentration of Ca(II) metal ions was 72.7702 mg/L to 4.877 mg/L, with adsorption efficiency of 93.3% and adsorption capacity of 6.7893 mg/g.","PeriodicalId":495408,"journal":{"name":"Helium Journal of Science and Applied Chemistry","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135503535","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}

引用次数: 0