Sampling and atomic absorption spectrometric determination of arsine at the 2 .mu.g/m3 level

Abstract

A method has been developed and refined for the sampling and analytical measurement of arsine at the 2 µ / 3 level with a collection period of 15 min. Arsine standard samples were collected on charcoal, recovered by acid desorption, and analyzed by a combined chemical modification-flameless atomic absorption technique utilizing a heated graphite atomizer (HGA). Mean percent recovery and relative standard deviation were 89.1 % and ±0.10, respectively, for 105 samples over the sampling and analysis procedure. The chemical modification prevents sample loss during analysis and results In Improvements In sensitivity and linearity over previously employed methods. A calibration system employing a twofold dilution was fabricated to generate arsine standard samples In the 1 to 10 pg/m3 range.

Fixation, transformation, and mobilization of arsenic in sediments

“…Analytical variability was considerably less, averaging 3% for total As, 8.9% for As(V), and 6.8% for inorganic As in a water matrix. These CV's were comparable to those reported by other workers for analyses of various As compounds (27,32,33).…”

An evaluation of column chromatography and flameless atomic absorption spectrophotometry for arsenic speciation as applied to aquatic systems

“…The precision and sensitivity of this procedure are due to the addition of Ni(NO,3)2, which is thought to form nonvolatile nickel arsenides at charring temperatures between 310 and 1200 °C (18, [25][26][27]. The higher charring temperatures remove organic interferences that may be found in natural and polluted waters.…”