Gas chromatographic determination of dimethylarsinic acid in aqueous samples.
Procedures are described for the determination of dimethylarsinic acid in aqueous samples by gas chromatography of iododimethylarsine. Dimethylarsinic acid is converted into iododimethylarsine rapidly and quantitatively by treatment with hypophosphorous acid and potassium iodide, the resulting iododimethylarsine is extracted with toluene and determined with a gas chromatograph equipped with an electron-capture detector. The detection limit is 0.005 ppm as As. Recoveries from urine are over 95%. Other arsenicals do not give any response in the chromatography. The method has been applied to the determination of dimethylarsinic acid in urine and in water extracts of sea-weeds.
Fukui
S
S
Kyoto College of Pharmacy, Yamashinaku, Kyoto, Japan.
Hirayama
T
T
Nohara
M
M
Sakagami
Y
Y