US EPA

1371960 

Technical Report 

Determination of organic arsenicals in pesticide formulations by ion chromatography 

Gehrig, CC; Fitzpatrick, TM 

1989 

BIOSIS/90/03385 

72 

6 

994-996 

eng 

BIOSIS COPYRIGHT: BIOL ABS. The organic arsenicals, cacodylic acid and methanearsonic acid and their salts, are determined in pesticide formulations by ion chromatography. The samples are diluted in the aqueous mobile phase, injected directly into the chromatograph, and determined by nonsuppressed ion chromatography. Analysis time is less than 5 min for each arsenical. The method was tested for precision, linearity, and recovery. Linearity of the methanearsonic acid gave regression and correlation coefficients of 0.9998 and 0.9999, respectively, and 0.9997 and 0.9998 for cacodylic acid. Quadruplicate analyses of 5 methanearsonic acid samples gave relative standard deviations of 0.833-3.10. Quadruplicate analyses of 4 cacodylic acid samples gave relative standard deviations of 0.648-1.41. Recovery was 100.3 | 3.6%. 

Biochemical Methods-General; Biochemical Studies-General; Biophysics-General Biophysical Techniques; Pest Control