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GFAAS Determination of Chromium and Its Compounds in Air Over Working-place

Peng Wei-fang

Abstract

Air sample over working-place was collected by using microporous filtering film with a flow-rate of 5 L·min-1 for 15 min,and the content of chromium in sample was determined by GFAAS.Temperatures selected for ashing and atomization were 1300 ℃ and 2 400 ℃ respectively.Linear relationship between values of absorbance and mass concentration of Cr was obtained in the range within 5 mg·L-1,with detection limit(3s/k) of 6.81×10-4mg·m-3.The proposed method was used in the analysis of air sample,values of recovery found by standard addition method were in the range of 98.8%-100.7%,and values of RSD′s(n=6) found were in the range of 2.2%-2.4%.

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Key concepts: Chromium, Analytical Chemistry (journal), Ashing, Detection limit, Absorbance, Microporous material, Chemistry, Standard addition