scholarly journals Investigation of pesticide residues in surface water in some areas of agricultural production at Ho Chi Minh city

2013 ◽  
Vol 16 (3) ◽  
pp. 106-119
Author(s):  
Phu Ly Sy Nguyen ◽  
Nguyen Duc Do ◽  
Hien Thi To
Keyword(s):  
Surface Water ◽  
Pesticide Residues ◽  
Agricultural Production ◽  
Chromatographic Method ◽  
Organophosphorus Pesticides ◽  
Ho Chi Minh City ◽  
Growth Stages ◽  
High Concentrations ◽  
Gas Chromatographic Method ◽  
Agricultural Areas

Residual levels of organochlorine and organophosphorus pesticides in surface water in some agricultural areas at Ho Chi Minh City were investigated in 2012. Four organophosphorus pesticides including Malathion, Parathion, Ethion and Trithion and seven organochlorine pesticides including Alpha - HCH, beta-HCH, gammaHCH, aldrin, Heptachlor – epoxide, AlphaEndosulfan and Endosulfan-sulfate were determined in the surface water in four dicstricts : Binh Chanh, Hoc Mon, Cu Chi and Binh Tan using gas chromatographic method with electron capture detector (GCECD). The results showed that residues of pesticide were found with high concentrations in surface water in agricultural areas and pesticide residues changed depending on growth stages of crops. The concentration and distribution of pesticides were different in the water samples at different sites. Residues of pesticides such as Parathion, Ethion and Trithion were detected in surface water although these chemicals had been banned.

Research on Detection and Distribution of Organic Chlorine Content in the Chin-Sha River Basin

2014 ◽  
Vol 686 ◽  
pp. 40-44
Author(s):  
Ru Ling Zhang
Keyword(s):  
Organochlorine Pesticides ◽  
River Basin ◽  
Organochlorine Pesticide ◽  
Pesticide Residues ◽  
Chromatographic Method ◽  
Industrial Area ◽  
Soil Samples ◽  
Organochlorine Pesticide Residues ◽  
Organic Chlorine ◽  
Gas Chromatographic Method

This paper collected 18 soil samples in the Chin-sha River basin, and analyzed residues of organochlorine pesticides (OCPs) in soil using gas chromatographic method, revealing the organochlorine pesticide residues, the distribution and sources in the river basin. The results show that, the relatively high sampling residues of organochlorine pesticide distribute in the industrial area. The composition and characteristics of organic chlorine pesticide show that the organochlorine pesticide residues in soil mainly come from the historical use. Compared with the domestic similar research, residual organochlorine pesticides in Chin-sha River basin were lower.

Rapid Gas Chromatographic Method for Screening of Pesticide Residues in Milk

1974 ◽  
Vol 57 (1) ◽  
pp. 173-175
Author(s):  
Joe Gabica ◽  
Michael Watson ◽  
Woodrow W Benson
Keyword(s):  
Gas Chromatography ◽  
Diethyl Ether ◽  
Pesticide Residues ◽  
Extraction Method ◽  
Chromatographic Method ◽  
Large Numbers ◽  
Hexane Extracts ◽  
Gas Chromatographic Method ◽  
Soluble Material

Abstract A rapid version of the official AOAC milk extraction method, modified to exclude lengthy chromatographic cleanup, is described. Lipid-soluble material is extracted with a diethyl ether-hexane mixture. Pesticides are then partitioned into acetonitrile and are reextracted with hexane. The concentrated hexane extracts are analyzed by gas chromatography, providing relatively sensitive results with a minimum of interfering extraneous peaks. This method may be useful in screening large numbers of samples and indicating those that may require more thorough analysis.

Collaborative Study of a Method for Multiple Organophosphorus Pesticide Residues in Nonfatty Foods

1967 ◽  
Vol 50 (2) ◽  
pp. 430-439
Author(s):  
John R Wessel
Keyword(s):  
Electron Capture ◽  
Pesticide Residues ◽  
Chromatographic Method ◽  
Methyl Parathion ◽  
Collaborative Study ◽  
Organophosphorus Pesticide ◽  
Leafy Vegetables ◽  
Multiple Detection ◽  
Gas Chromatographic Method ◽  
Ppm Level

Abstract Twelve collaborators from 6 laboratories studied a multiple detection gas chromatographic method (potassium chloride thermionic plus electron capture) for ronnel, ethion, Trithion, diazinon, methyl parathion, parathion, and malathion in leafy vegetables (lettuce) and fruits (apples). Residues were present at the 0.5 and 5.0 ppm levels. Average recoveries for the 7 residues at the 0.5 ppm level were 88.7% (by thermionic) and 91.2% (by electron capture) from apples. At the 5.0 ppm level, average recoveries were 89.0% (by thermionic) and 89.4% (by electron capture) from lettuce. Residues in most instances were confirmed by TLC.

Pharmaceuticals in the Yamaska River, Quebec, Canada

2007 ◽  
Vol 42 (4) ◽  
pp. 231-239 ◽  
Author(s):  
Viviane Yargeau ◽  
Antonina Lopata ◽  
Chris Metcalfe
Keyword(s):  
Surface Water ◽  
North America ◽  
Water Samples ◽  
Pharmaceutically Active Compounds ◽  
Urban Centers ◽  
Basic Drug ◽  
Active Compounds ◽  
High Concentrations ◽  
Agricultural Areas ◽  
Surface Water Samples

Abstract Pharmaceutically active compounds have been detected in North America and Europe in groundwater, surface water, wastewater, and drinking water. In the province of Quebec in Canada, there has been little data to assess the occurrence of pharmaceutical residues in the aquatic environment. In August of 2005, samples of surface water were collected at 10 sites along the Yamaska River basin in Quebec, which passes through important agricultural areas and receives wastewater from several urban centers with populations ranging up to 44,000 residents. Several acidic drugs (naproxen, ibuprofen, gemfibrozil), neutral drugs (caffeine, carbamazepine, cotinine), and the sulfonamide antibiotic sulfamethoxazole were detected in the majority of the surface water samples. The antidepressant fluoxetine (neutral/basic drug) was not detected in any samples, while acetaminophen (acidic drug) was detected at only two sites, and sulfapyridine (sulfonamide antibiotic) was detected at only one site. Sulfamethoxazole and carbamazepine were present at the highest maximum concentrations of 578 ng/L and 106 ng/L, respectively. The concentrations of most of the target pharmaceutically active compounds observed in surface water samples within the watershed were generally consistent with the number of people in urban centers near the sampling sites when compared with other studies in urban watersheds. However, carbamazepine, naproxen, and sulfamethoxazole were present at surprisingly high concentrations for some of the low density areas. Overall, these results demonstrate that pharmaceuticals are distributed in surface waters within a watershed in Quebec at concentrations similar to levels observed in previous studies done in other parts of North America.

scholarly journals A Survey on the Methanol Content of Home Distilled Alcoholic Beverages in Transylvania (Romania)

2013 ◽  
Vol 59 (4) ◽  
pp. 206-208 ◽  
Author(s):  
Croitoru Md ◽  
Topor Elena ◽  
Fülöp Ibolya ◽  
Fogarasi Erzsébet
Keyword(s):  
Chromatographic Method ◽  
Methanol Concentration ◽  
Alcoholic Beverages ◽  
Methanol Content ◽  
Alcoholic Drinks ◽  
High Concentrations ◽  
Gas Chromatographic Method ◽  
Plum Brandy ◽  
Chronic Use ◽  
Made In

Abstract Objective: Methanol appears in relatively high concentrations in alcoholic beverages obtained from fermented fruits distillates. These products are traditionally home made in many regions in Romania and other EU countries. The chronic use of products with high methanol concentration can be considered a health risk. The purpose of this work was to measure methanol concentration in a Romanian region where brandy-type alcoholic products are made from different fruits (plum, apple, pear, grapes), and to observe if there is a type of product that contains more methanol than the others. Methods: The content of methanol in the tested alcoholic beverages was determined using a gas chromatographic method. Results: Only 18% of the tested 56 samples met UE regulation regarding methanol content of alcoholic beverages (0.4% in alcoholic drinks containing 40% ethanol). The highest concentration of 2.39% was found in a plum brandy. Plum brandies contained significantly higher amounts of methanol than brandies made from other fruits (0.91 vs 0.52%, p = 0.01). Conclusions: Home distilled alcoholic beverages obtained from fruits are a health threat due to their high methanol content. Strict regulations and tests should be introduced for such products

Evaluation of a new valproic acid enzyme immunoassay and comparison with a capillary gas-chromatographic method.

1981 ◽  
Vol 27 (1) ◽  
pp. 169-172 ◽  
Author(s):  
S L Braun ◽  
A Tausch ◽  
W Vogt ◽  
K Jacob ◽  
M Knedel
Keyword(s):  
Valproic Acid ◽  
Enzyme Immunoassay ◽  
Chromatographic Method ◽  
Comparison Method ◽  
Manual Method ◽  
Analytical Recovery ◽  
Significant Difference ◽  
High Concentrations ◽  
Assay Precision ◽  
Gas Chromatographic Method

Abstract A new homogeneous immunoassay (EMIT) for valproic acid was evaluated. Besides testing the manual version of this enzyme immunoassay, we also developed two mechanized procedures for centrifugal analyzers (the CentrifiChem and the COBAS system), which take less time and are more precise than the manual method. Within-assay precision (CV) was 4.5% with the manual technique and 2% with the analyzers. Between-assay precision (CV) ranged from 4 to 13% for all three techniques. Accuracy of th manual method was checked by dilution and analytical recovery experiments. Our comparison of the EMIT results with those obtained by a comparison method (capillary gas chromatography) showed no significant difference. No interference from hemolysis, hyperbilirubinemia, or aliphatic amino acids was observed. At high concentrations of bile acids and with lipemic sera the analytical recovery rates decreased slightly, to 87% and 92%, respectively.

Validation of a QuEChERS-based gas chromatographic method for analysis of pesticide residues inCassia angustifolia(senna)

2016 ◽  
Vol 51 (8) ◽  
pp. 508-518 ◽  
Author(s):  
Vandana Tripathy ◽  
Ajoy Saha ◽  
Dilipkumar J. Patel ◽  
B. B. Basak ◽  
Paresh G. Shah ◽  
...  
Keyword(s):  
Pesticide Residues ◽  
Chromatographic Method ◽  
Gas Chromatographic Method
Sign in / Sign up

Export Citation Format

Share Document