
Contents
7.6.47
AOAC Official Method 982.04
PCNB in Pesticide Formulations: Gas Chromatographic Method
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Published:January 2023
Cite
PCNB in Pesticide Formulations: Gas Chromatographic Method', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1982
Final Action 1983
Principle
Test portion is dissolved in CHCl3, o-terphenyl is added as internal standard, and PCNB is determined by GC with flame ionization detection.
Apparatus and Reagents
...
Preparation of Test Solution
...
Determination and Calculation
Inject 4 µL aliquots of mixed standard solution until variation in response ratio (area or peak height) for PCNB (first peak) to o-terphenyl (second peak) is ca 1%. Inject mixed standard, inject test solution twice, and repeat injection of mixed standard. Retention times must be the same for test and standard solutions.
Calculate average ratios of PCNB to o-terphenyl for the 2 mixed standard and test solution injections, and calculate percent PCNB.
...
where R and R' = average response ratios for test solution and mixed standard, respectively; W' = g PCNB/100 mL standard solution; W = g test portion extracted; and P = purity (%) of PCNB standard.
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