Pesticide Residues, Determination of Organic Chlorides and Residues from Chlorinated Pesticides by Combustion Analysis

1957 ◽  
Vol 5 (5) ◽  
pp. 351-354 ◽  
Author(s):  
J. A. Hudy ◽  
C. L. Dunn
Keyword(s):  
Pesticide Residues ◽  
Combustion Analysis ◽  
Chlorinated Pesticides ◽  
Residues Determination

Pesticide Residues, Determination of Diphenylamine Residues on Apples

1958 ◽  
Vol 6 (8) ◽  
pp. 597-600 ◽  
Author(s):  
R. B. Bruce ◽  
J. W. Howard ◽  
J. B. Zink
Keyword(s):  
Pesticide Residues ◽  
Residues Determination

Pesticide Residues, Determination of Cycloheximide (Acti-dione) Residues in Cherries

1956 ◽  
Vol 4 (4) ◽  
pp. 343-345 ◽  
Author(s):  
G. C. Prescott ◽  
Harold Emerson ◽  
J. H. Ford
Keyword(s):  
Pesticide Residues ◽  
Residues Determination

Simple, Low-Cost Method for Determination of Selected Chlorinated Pesticides in Fat Samples

1982 ◽  
Vol 65 (3) ◽  
pp. 677-679 ◽  
Author(s):  
Stefan M Waliszewski ◽  
Grzegorz A Szymczyński
Keyword(s):  
Gas Chromatography ◽  
Petroleum Ether ◽  
Electron Capture ◽  
Silica Gel ◽  
Pesticide Residues ◽  
Low Cost ◽  
Electron Capture Detection ◽  
Chlorinated Pesticides ◽  
Qualitative Determination

Abstract A method is described for the quantitative and qualitative determination of selected chlorinated pesticides in fat samples. Pesticide residues are extracted with petroleum ether and separated from fat with concentrated H2SO4 instead of the commonly used adsorbents Florisil, alumina, or silica gel. Residues were analyzed by gas chromatography with electron capture detection. Recoveries of fortified samples were approximately 100%.

scholarly journals An quantificational method for 51 pesticide residues determination in Pu'er tea by LC-MS/MS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Xudong Wu ◽  
Zeyu Chen ◽  
Jiankang Zhang ◽  
Hongping Man ◽  
Tao Che ◽  
...  
Keyword(s):  
Pesticide Residues ◽  
Black Tea ◽  
The European Union ◽  
Acceptable Range ◽  
Maximum Residue Levels ◽  
Residues Determination ◽  
Residue Levels ◽  
Linear Concentration Range ◽  
Linear Concentration

<p>Pesticide residues in tea is a major issue due to their widely used in tea cultivation. Thus, to protect consumers, an appropriate method for determination of their residues in tea should be done. In this study, a method for the simultaneous determination of 51 pesticides in tea was developed and validated. The tea sample was extracted by acetonitrile and purified SPE clearnet TPT column followed by liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS) with multi-reaction monitoring (MRM) mode. The method was validated according to the linearity, limit of detention, precision, the percentage of recovery at three different spike levels. The linear concentration range used was 10-100ng/ mL, the square of Correlation coefficient r2 was more than &gt;0.995. Recoveries were adequate being in the acceptable range of 72-89% and RSD of &lt;19 % for all the analytes at three level of 0.01,0.05 and 0.11mg/kg, the LOD of all chemicals from 0.001 mg/kg to 0.01 mg/kg .The method was applied for the determination for 400 tea samples collected from Pu'er which contain green tea and black tea. Among the analyzed samples , 36 % samples had Imidacloprid and 25% sample contain Acetamiprid, which were at a level below the European Union maximum residue levels (EU-MRLs). The information would be beneficial for Pu'er tea exporters.</p>

Estimation of Chlorinated Pesticide Residues in Animal and Vegetable Oils

1968 ◽  
Vol 51 (1) ◽  
pp. 45-47
Author(s):  
J Singh ◽  
J D Lanthier
Keyword(s):  
Pesticide Residues ◽  
Cottonseed Oil ◽  
Chlorinated Pesticides ◽  
Butter Oil ◽  
Average Recovery ◽  
Qualitative And Quantitative ◽  
Basic Alumina ◽  
Seal Oil ◽  
Alumina Activity

Abstract A procedure for the determination of chlorinated pesticide residues in cottonseed oil, hydrogenated marine oil, seal oil, butter oil, and processed beef tallow is described. The oil is spread in the form of a thin film over a large surface area provided by Celite 545. The pesticides are extracted from the oil-coated Celite with 80% aqueous acetonitrile, partitioned into Skellysolve F, and cleaned up on a basic alumina (activity III) column. Gas chromatography with an electron capture detector is used for qualitative and quantitative estimations. The average recovery of six commonly used chlorinated pesticides (aldrin, dieldrin, heptachlor, heptachlor epoxide, lindane, and p,p'-DDT) at levels of 0.1 and 0.25 ppm ranged from 82 to 106%.

Sign in / Sign up

Export Citation Format

Share Document