โ Scribed by William H Lamont
No coin nor oath required. For personal study only.
Concentrations of inorganic arsenic were determined by ion-trap, electrospray, mass spectrometry in 40 samples of white rice, which were collected in the United States. Inorganic arsenic was qualitatively present in all samples. The quantitative range of concentrations of inorganic arsenic extended from o0.025 to 0.271 mg/g (wet-mass basis). The extremes of the range were validated with acceptable analytical recoveries of fortifications. Statistical bounds of the range were established and assessed. The distribution of concentrations over the observed range was characterized statistically with an empirical lognormal probability distribution function. For the samples of white rice, a geometric mean corresponding to 0.112 mg/g and a geometric standard deviation equivalent to 0.055 mg/g of inorganic arsenic were derived from the empirical lognormal function.
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