The Evaluation of the Cleanup Efficiency of SPE Cartridge Newly Developed for Multiresidues in Tea

2018 ◽  
pp. 309-494
Author(s):  
Guo-Fang Pang ◽  
Chun-Lin Fan ◽  
Qiao-Ying Chang ◽  
Fang Yang ◽  
Yan-Zhong Cao
Keyword(s):  
Cleanup Efficiency

Analysis of Aflatoxins in Sunflower Seeds and Sunflower Meal

1973 ◽  
Vol 56 (1) ◽  
pp. 219-222
Author(s):  
Julia Karmelic ◽  
Mery Israel ◽  
Sara Benado ◽  
Carmen Leon
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Silica Gel ◽  
Silica Gels ◽  
Sunflower Seeds ◽  
Sunflower Meal ◽  
Cleanup Efficiency ◽  
Acetone Water ◽  
Layer Chromatography

Abstract Aflatoxins are extracted from sunflower seeds and meal by chloroform, eluted from a silica gel column, and determined by thin layer chromatography (TLC), using chloroform-acetone-water-2-propanol as the developing solvent. In addition, the TLC step also removes interfering material from some sunflower varieties which is not removed by the cleanup column. Various silica gels were tested for cleanup efficiency. Recoveries of added B1, B2, G1, and G2 were satisfactory.

CLEANUP EFFICIENCY OF A FUEL OIL SPILL IN COLD WEATHER

1979 ◽  
Vol 1979 (1) ◽  
pp. 419-427 ◽  
Author(s):  
Eric Schrier ◽  
Carl Eidam
Keyword(s):  
Oil Spill ◽  
Environmental Conditions ◽  
Fuel Oil ◽  
Previous Experience ◽  
Cold Weather ◽  
Cold Climates ◽  
Significant Progress ◽  
Cleanup Efficiency ◽  
Snow Conditions

ABSTRACT When the difficulties imposed by the ice and snow conditions and the lack of previous experience with spills in ice-infested waters are considered, the cleanup effort at Buzzards Bay was commendable; roughly 89,000 liters (28 percent) of oil were recovered. Of the cleanup techniques used, shore-based vacuum skimming was most successful. Contaminated ice removal was least successful. Burning of oil pools was not used extensively but showed some promise. Modifications of the vacuum skimming technique to prevent the vacuum lines from freezing are recommended. In addition, expanded use of burning and the endless rope skimming techniques are recommended for future spills in similar environmental conditions. Only pooled oil should be collected; oil incorporated in ice should be allowed to go to sea. Removal of shorefast ice is not recommended. The Marco and the Lockheed skimmers were not effective at Buzzards Bay, but may be applicable under similar circumstances if modified or used in a stationary position. Adopting the above recommendations could improve cleanup efficiency at future spills; however, further research in modifying existing equipment and development of new equipment for all types of cold climates will be necessary if significant progress is to be made.

Rapid Florisil Cleanup Method for Analysis of Chlorinated Pesticide Residues

1979 ◽  
Vol 62 (1) ◽  
pp. 85-88
Author(s):  
Robert M Stimac
Keyword(s):  
Chromatographic Analysis ◽  
Residue Analysis ◽  
Pesticide Residue Analysis ◽  
Wet Milling ◽  
Chlorinated Pesticides ◽  
Florisil Column ◽  
Cleanup Efficiency ◽  
Cleanup Procedure ◽  
One Step ◽  
Corn Wet Milling

Abstract A modification of the current Florisil chromatographic cleanup procedure for pesticide residue analysis is presented. By prewashing the Florisil column with a specified quantity of ethyl ether, many chlorinated pesticides, including dieldrin and endrin, can be eluted in one step. The demonstrated cleanup efficiency of the proposed method eliminates the need for further cleanup, since the concentrated eluate is suitable for gas chromatographic analysis. Recovery of 13 chlorinated pesticides in typical products of corn wet milling ranged from 85 to 115%.

Comparison of Four Extraction and Cleanup Procedures for Chlorinated Pesticide Residues in Eggs

1969 ◽  
Vol 52 (1) ◽  
pp. 172-175
Author(s):  
John R Wessel
Keyword(s):  
Rapid Method ◽  
Pesticide Residues ◽  
Single Layer ◽  
Heptachlor Epoxide ◽  
Cleanup Efficiency ◽  
Egg Extracts ◽  
Exhaustive Extraction

Abstract The extraction efficiencies, based on the amount of pesticide removed by an exhaustive extraction, of four procedures were compared for effectiveness in removal of chlorinated pesticide residues incurred in eggs from hens fed lindane, DDE, DDT, heptachlor epoxide, dieldrin, and endrin. Acetonitrile, as used in the Mills, Onley, and Gaither method for nonfatty foods, yielded results equivalent to the exhaustive extraction, the double acetonitrile extraction by blending, and the Sawyer rapid method for eggs. Two types of Florisil columns, a split layer and a single layer column, were compared for cleanup efficiency of egg extracts from the Sawyer and the Mills et al. methods. Results of these studies indicate that the Mills et al. rapid method is applicable for the analysis of chlorinated pesticide residues in eggs at a level of 0.01 ppm.

In-Situ Burning of Oil in Coastal Marshes. 2. Oil Spill Cleanup Efficiency as a Function of Oil Type, Marsh Type, and Water Depth

2005 ◽  
Vol 39 (6) ◽  
pp. 1855-1860 ◽  
Author(s):  
Qianxin Lin ◽  
Irving A. Mendelssohn ◽  
Kenneth Carney ◽  
Scott M. Miles ◽  
Nelson P. Bryner ◽  
...  
Keyword(s):  
Oil Spill ◽  
Water Depth ◽  
Coastal Marshes ◽  
Cleanup Efficiency ◽  
Marsh Type ◽  
Oil Spill Cleanup ◽  
Oil Type

Comparison of Ten Methods for the Analysis of Milk for Residues of Chlorinated Pesticides

1969 ◽  
Vol 52 (4) ◽  
pp. 817-824
Author(s):  
James H Lawrence ◽  
Jerry A Burke
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Electron Capture ◽  
Heptachlor Epoxide ◽  
Chlorinated Pesticides ◽  
Cleanup Efficiency ◽  
Layer Chromatography

Abstract Ten methods for the analysis of milk for residues of chlorinated pesticides were used to analyze a sample of milk containing a residue of heptachlor epoxide and fortified with p,p’-TDE, 1.00 p pm fat basis. Based on the p,p’-TDE determined, average recoveries above 90% were obtained with six methods, and 89, 85, 79, and 56% recoveries, respectively, with four methods. Cleanup efficiency for determination by electron capture GLC and thin layer chromatography varied from good to poor.

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