Improvement of detection limits of flame-spectrophotometric determination of chlorinated organic pesticide residues

The Analyst ◽  
1969 ◽  
Vol 94 (1124) ◽  
pp. 1033 ◽  
Author(s):  
Roland Herrmann ◽  
Brigitte Gutsche
Keyword(s):  
Spectrophotometric Determination ◽  
Pesticide Residues ◽  
Detection Limits ◽  
Chlorinated Organic

scholarly journals Utility of Certain π-Acceptors for the Spectrophotometric Determination of Hydralazine Hydrochloride

2003 ◽  
Vol 71 (3) ◽  
pp. 179-194
Author(s):  
W. El-Hawary ◽  
A. Shoukry ◽  
A. Talat
Keyword(s):  
Spectrophotometric Determination ◽  
Good Accuracy ◽  
Picric Acid ◽  
Pharmaceutical Preparations ◽  
Detection Limits ◽  
Several Variables ◽  
Accuracy And Precision ◽  
Hydralazine Hydrochloride ◽  
Ml Detection

The interaction of hydralazine hydrochloride with picric acid (I), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) (II), 2,4-dinitrobenzoic acid (III), bromanil (IV) and chloranil (V) was found to be useful for its spectrophotometric determination. The determination was carried out at 520, 510, 550, 540 and 535 nm for the reaction with (I), (II), (III), (IV) and (V), respectively. The effect of several variables on the colouring process was studied. The proposed methods have been applied successfully for the determination of hydralazine hydrochloride in pure samples and in pharmaceutical preparations with good accuracy and precision. The results were compared to those obtained by the official and pharmacopoeia1 methods. The linear ranges for obedience of Beer's law are up to 118, 54,639, 27.5 and 78.6 mg/l, Ringbom ranges are 13-100, 7.6-44.7, 77.4-445.0, 5.8-25.8 and 22.5-63.1 μg/ml, Detection limits are 4.8, 2.2, 18.4, 1.2 and 5.9 mg/l, and RSD 0.042, 0.037, 0.043, 0.013 and 0.073 for reactions of hydralazine hydrochloride with I, II, III, IV and V, respectively.

Determination of Micro Quantities of Some Chlorinated Organic Pesticide Residues in Edible Fats and Oils

1963 ◽  
Vol 46 (2) ◽  
pp. 182-186
Author(s):  
Martin Eidelman
Keyword(s):  
Dimethyl Sulfoxide ◽  
Pesticide Residues ◽  
Edible Oils ◽  
Detection System ◽  
Fats And Oils ◽  
Fish Oils ◽  
Edible Fats ◽  
Background Material ◽  
Chlorinated Organic

Abstract The dimethyl sulfoxide procedure was extended to eleven edible oils and fish oils. After cleanup, the detection system of choice may be used. If extracts of samples larger than 20 g are injected into the microcoulometric detection system, halogenated background material will make evaluation difficult. In fish oils, when paper chromatography is used for evaluation, an Rf indicating aldrin must be further investigated, since it is possible that a spot at this Rf might be background material.

scholarly journals DETERMINAÇÃO DE RESÍDUOS DE AGROTÓXICOS ORGANOCLORADOS EM HORTALIÇAS

2002 ◽  
Vol 12 ◽  
Author(s):  
MARIA TERESA PLATA OVIEDO ◽  
MARIA CECÍLIA DE FIGUEIREDO TOLEDO ◽  
EDUARDO VICENTE
Keyword(s):  
Gas Chromatography ◽  
Pesticide Residues ◽  
Detection Limits ◽  
Heptachlor Epoxide ◽  
Endosulfan Sulfate ◽  
Average Recovery ◽  
Pesticides Residues ◽  
Organochlorine Pesticide Residues ◽  
The University

Foram analisados resíduos de Clorotalonil, Aldrin, Dieldrin, Heptacloro, Heptacloro epóxido, Endosulfan alfa, Endosulfan beta e Sulfato de Endosulfan nas seguintes hortaliças: alface, acelga, chicória, repolho, tomate, chuchu, batata, cenoura, mandioca e mandioquinha. As amostras foram coletadas no restaurante da Universidade Estadual de Campinas, no período de abril/1998 a abril/ 2001 e nas Centrais de Abastecimento de Campinas, no período de abril a agosto/2001. Os resíduos dos agrotóxicos organoclorados foram determinados por cromatografia a gás com detector de captura de elétrons (CG-DCE- 63Ni). Os limites de detecção (LD) encontrados para Clorotalonil, Aldrin, Dieldrin, Heptacloro, Heptacloro epóxido, Endosulfan alfa, Endosulfan beta e Sulfato de Endosulfan foram 0,0006, 0,0006, 0,0008, 0,0006, 0,0007, 0,0008, 0,0009 e 0,0016 mg/kg, e os limites de quantificação 0,002, 0,002, 0,003, 0,002, 0,003, 0,003, 0,003 e 0,005 mg/kg, respectivamente. A recuperação média dos agrotóxicos analisados variou de 76,0 a 97,0% em repolho, de 90,0 a 103,0% em tomate e de 81,0 a 106,0% em batata. Em todas as amostras de hortaliças analisadas (n=151), os níveis residuais de agrotóxicos apresentaram-se abaixo dos limites de detecção (LD) do método validado. DETERMINATION OF ORGANOCHLORINE PESTICIDES RESIDUES ON VEGETABLES Abstract Residues of Chlorotalonil, Aldrin, Dieldrin, Heptachlor, Heptachlor epoxide, alpha and beta Endosulfan and Endosulfan sulfate were analysed in the following vegetables: lettuce, swiss chad, chicory, cabbage, tomato, chayote, potato, carrot, cassava and cassava specy. The samples were collected at the restaurant of the University of Campinas, from April/1998 to April/2001 at the “Centrais de Abastecimento de Campinas (CEASA)”, from April to August/2001. The organochlorine pesticide residues were determined by gas chromatography with an electron capture detector (ECD-63Ni). The detection limits of Chlorotalonil, Aldrin, Dieldrin, Heptachlor, Heptachlor epoxide, alpha and beta Endosulfan and Endosulfan sulfate were 0.0006, 0.0006, 0.0008, 0.0006, 0.0007, 0.0008, 0.0009 and 0.0016 mg/kg respectively, and their quantification limits were 0.002, 0.002, 0.003, 0.002, 0.003, 0.003, 0.003 and 0.005 mg/kg. The average recovery of the pesticides varied between 76.0 and 97.0% for cabbage, 90,0 to 103.0% for tomato and 81.0 to 106.0% for potato. The samples analysed (n=151) showed pesticide levels below the detection limits of the validated method.

scholarly journals Derivative spectrophotometric determination of acetamiprid in the presence of 6-chloronicotinic acid

2012 ◽  
Vol 77 (7) ◽  
pp. 911-917 ◽  
Author(s):  
Valéria Guzsvány ◽  
Sanja Lazic ◽  
Natasa Vidakovic ◽  
Zsigmond Papp
Keyword(s):  
Simultaneous Determination ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Detection Limits ◽  
Model Systems ◽  
Order Derivative ◽  
Zero Crossing ◽  
First Order ◽  
Relative Standard

A simple first-order derivative spectrophotometric method was developed for the simultaneous determination of acetamiprid and 6-chloronicotinic acid (6-CNA) at pH 7.0. By using the zero-crossing approach, acetamiprid was determined at 269.0 nm and 6-CNA at 216.0 nm with the detection limits of 7.19x10-7 and 8.25x10-7 mol dm-3, respectively and relative standard deviations not exceeding 1.2% in the case of model systems.

scholarly journals Research on a rapid detection method of pesticide residues in milk by enzyme inhibition

2019 ◽  
Vol 79 ◽  
pp. 03013
Author(s):  
Xiao-mei Yang ◽  
Yi-peng Gu ◽  
Shu-jie Wu ◽  
Ling Feng ◽  
Fang Xie
Keyword(s):  
Enzyme Inhibition ◽  
Pesticide Residues ◽  
Rapid Detection ◽  
Detection Method ◽  
Reaction System ◽  
Detection Limits ◽  
Color Intensity ◽  
Color Reactions ◽  
Carbamate Pesticide

A rapid detection method of pesticide residues in milk by enzyme inhibition was researched. Construction of a quickly reaction system of enzyme inhibition for determination of organophosphorus and carbamate pesticide residues was achieved. The analysis of color reactions of milk showed a good correlation between color intensity and content of tolclofos-methyl, methamidophos and isoprocarb 1-naphthalenyl methyl carbamate. The detection limits of the four pesticide were 0.5~1.0 mg/kg, which were below the level of detection required to satisfy legislation in china. This method is simple and inexpensive and suitable for rapid detection of pesticide residues in milk.

Spectrophotometric Determination of Total Cr in Water

2018 ◽  
Author(s):  
Xhulieta Hamiti ◽  
Ilirjana Boci ◽  
Pranvera Lazo
Keyword(s):  
Spectrophotometric Determination
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