AOAC Test Method 990.06


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Source:
AOAC

Method Name:
Organochlorine Pesticide in Water by GC. Official Name: Organochlorine Pesticides in Finished Drinking Water by Gas Chromatographic Method

Description:
Measured volume of test portion (1 L) is extracted with CH2Cl2 by shaking in separatory funnel or mechanical tumbling in bottle. CH2Cl2 extract is separated, dried with anhydrous Na2SO4, solvent exchanged with methyl tert-butyl ether (MTBE), and concentrated to 5 mL. Pesticides are separated and measured by capillary column gas chromatography with electron-capture detection. Estimated method detection limits range from 0.0015 g/L for gamma-chlordane to 5 g/L for chlorobenzilate; values for 24 compounds range between 0.025 and 0.5 g/L.

Scope:
Applicable to the determination of 29 organochlorine pesticides in drinking water.

Citation:
Official Methods of Analysis of AOAC International, 16th Edition, 4th Revision, 1998 Volume I

Interferences:
(1) Contamination of samples, solvent, and carrier gases with target analytes (especially compounds common to environmental laboratories, like methylene chloride).(2) Contamination of samples with sulfur (primarily present in base-neutral fractions).(3) Septum bleed (compounds from the injection septum are analyzed with the sample).(4) Column bleed (compounds from column coating break down, decreasing column efficiency).(5) Ghost peaks (compounds adsorb strongly to the column and carry over to later runs).(6) Coelution of species(7) Coextracted contaminants.(8) Phthalate esters interfere with detection of pesticides via electron capture detector.

QC Requirements:
IDMP, MB, SS, instrument QC std.

Maximum Holding Time:
7 days

Media:
WATER

Subcategory:
Organic

Concentration:
None given.

Precision:
Precision and accuracy data reflect multilaboratory method performance in reagent water. Note: Data in the method does not specify the concentration dependence of the stated precision.

Detection:
Estimated MDLs from Table 990.06B of the method.

Revision Number:
Final Action - 1993

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