Analusis最新文献_第6页

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000131

J. Goupy

引用次数: 1

Desirability approach for optimisation of electrothermal atomic absorption spectrometry factors in iron determinations 电热原子吸收光谱法测定铁的最佳化方法

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000133

S. Salomon, P. Giamarchi, A. Bihan

{"title":"Desirability approach for optimisation of electrothermal atomic absorption spectrometry factors in iron determinations","authors":"S. Salomon, P. Giamarchi, A. Bihan","doi":"10.1051/ANALUSIS:2000133","DOIUrl":"https://doi.org/10.1051/ANALUSIS:2000133","url":null,"abstract":"We report here on from determination in sea matrix by electrothermal atomic absorption spectrometry. We optimised the experimental conditions of the spectroscopic factors, i.e. entrance monochromator slit height, slit width and lamp current, and of the electrothermal factors, i.e. calcination temperature, calcination duration, atomisation temperature and injected volume, since these two groups are independent. Because of the technical constraints occuring on our experimental domain of study we built a D-optimal experimental design to conduct these optimisations. We monitored three experimental responses, i.e. the standard deviation of the instantaneous specific absorbance, the specific integrated absorbance and the non-specific integrated absorbance. The three of them clearly showed an optimum in three opposed experimental conditions. Consequently, a desirability transformation of the experimental responses permitted us to obtain a better compromise. We, finally, computed a new experimental response which took the raw measurements into account to directly estimate the limits of detection. The optimisation of this computed response showed us that the lowest detection limit was obtained under the same experimental compromise than the one suggested by the desirability study. This result allowed us to validate the computed response as an interesting optimisation criterion in electrothermal atomic absorption spectrometry.","PeriodicalId":8221,"journal":{"name":"Analusis","volume":"52 1","pages":"575-586"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84014752","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: 7

Prediction of odours of aliphatic alcohols and carbonylated compounds using fuzzy partition and self organising maps (SOM) 用模糊划分和自组织图(SOM)预测脂肪族醇和羰基化合物的气味

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000139

K. Audouze, F. Ros, M. Pintore, J. Chrétien

{"title":"Prediction of odours of aliphatic alcohols and carbonylated compounds using fuzzy partition and self organising maps (SOM)","authors":"K. Audouze, F. Ros, M. Pintore, J. Chrétien","doi":"10.1051/ANALUSIS:2000139","DOIUrl":"https://doi.org/10.1051/ANALUSIS:2000139","url":null,"abstract":"A set of 114 olfactory molecules divided into fruity, ethereal and camphoraceous compounds, was submitted to an analysis by Kohonen Neural Networks, also known as Self Organising Map (SOM). The compounds are represented in a hyperspace derived from their molecular descriptors and SOM gives a useful projection of this hyperspace onto a 2D map. Owing to the complexity of the olfaction mechanism, evidenced by the fact that one compound can exhibit simultaneously different properties, SOM alone is unable to take into account the olfaction diversity of the original 114 compounds, Then, a Fuzzy Partition method was applied on the Kohonen map previously developed. The obtained results allowed delineating different representative zones for the three odours, expressing more closely the olfactory richness. The ability of the Hybrid System combining SO and Fuzzy Partition to model the three odours was validated by dividing the 114 compounds into a training set and a test set, including 86 and 28 molecules, respectively. The most important olfactory characteristics were reproduced satisfactorily for the entire test set compounds.","PeriodicalId":8221,"journal":{"name":"Analusis","volume":"35 1","pages":"625-632"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78564910","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: 10

For unitary "theory" of Chemometrics 对于化学计量学的统一“理论”

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000130

J. Chrétien

引用次数: 0

Characterisation of the staphylococcal enterotoxin research method in a dairy product 乳制品中葡萄球菌肠毒素研究方法的特点

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000137

L. Macaluso, C. Lapeyre

引用次数: 7

■ Development of an HPLC method for the determination of phenolic by-products: optimisation of the separation by means of the experimental designs methodology ■开发测定酚类副产物的高效液相色谱方法:通过实验设计方法优化分离

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000135

B. Motamed, J. Böhm, D. Hennequin, H. Texier, R. Mosrati, D. Barillier

引用次数: 3

Experimental design optimization of chromatographic separation for polycyclic aromatic hydrocarbons in vegetable oils 植物油中多环芳烃色谱分离的实验设计优化

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000134

A. Dorthe, J.-L. Ramberti, A. Thienpont

引用次数: 7

Central composite design and optimization by multiresponse analysis of octacalcium phosphate synthesis 八磷酸钙合成中心复合设计及多响应分析优化

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000132

J. Heughebaert, A. Lebugle, F. Vu, R. Phan-tan-luu

引用次数: 4

Chemometrics applied to the optimization of the preparation of hydrotropes for detergents starting from BTX fraction of natural gas 化学计量学应用于以天然气BTX馏分为原料制备洗涤剂用亲水物的优化

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000138

A. Kamoun, M. Chaâbouni

{"title":"Chemometrics applied to the optimization of the preparation of hydrotropes for detergents starting from BTX fraction of natural gas","authors":"A. Kamoun, M. Chaâbouni","doi":"10.1051/ANALUSIS:2000138","DOIUrl":"https://doi.org/10.1051/ANALUSIS:2000138","url":null,"abstract":"Manufacturers of cleaning products use hydrotopes to increase the solubility of surfactants in concentrated liquid detergents. In contrast to benzenesulfonate, alkylbenzenesulfonates with short chains (n < 4) are used as hydrotopes. In this paper, we present the results obtained from the preparation of toluenesulfonic and xylenesulfonic acids by selective sulfonation of toluene and xylenes present in the BTX fraction (benzene, toluene, xylenes) of the Tunisian natural gas MISKAR deposit. Chemometrics were applied to determine the optimal experimental conditions for the selective sulfonation of toluene and xylenes, we use a 2 IV 6-2 fractional factorial design in addition to several analytical methods (GC, HPLC, FTIR...). These conditions were found to be: the use of concentrated sulfuric acid as sulfonating agent, the azeotropic elimination of water during the reaction, a temperature of 110 °C, a duration of 9 hours and a molar ratio of sulfuric acid to toluene plus xylenes of 0.8. The application of all of these experimental conditions gives an aqueous phase with a composition that can be used very effectively as hydrotope agent in liquid detergents. This conclusion was the outcome from comparing the effect of our product on the clear point of a typical premium formulation of a liquid detergent to that of sodium xylenesulfonates, the most important hydrotope for light duty liquids.","PeriodicalId":8221,"journal":{"name":"Analusis","volume":"95 1","pages":"616-625"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77787095","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: 4

■ Modeling properties of water-based paints dried by microwaves from the design and analysis of a mixture-process experiment ■通过混合工艺实验的设计和分析，对微波干燥水性涂料的特性进行建模

Analusis Pub Date : 2000-09-01 DOI: 10.1051/ANALUSIS:2000136

S. Barra, F. Boulanger, A. Trapani, D. Cabrol-Bass

引用次数: 0