[GFAAS determination of trace Cr(III) and Cr(VI) after its separation by coprecipitation-floatation with aluminium hydroxide].
A method for determination of trace Cr(III) in natural water and drinking water by GFAAS after separation by coprecipitation-floatation with Al(OH)3 has been studied. Cr(VI) was determined also after being reduced by FeSO4. Conditions of Cr(III) floatation such as pH, the amount of floatation agent and coprecipitator-Aluminium added, the flow rate of nitrogen gas, the floatation time etc. were discussed. The influence of coexisting elements was investigated. The detection limit is 0.027 microg/L (n = 15). For Cr(III) concentration level of 0.5 microg/L, the RSD is 3.4% and the recovery of Cr(III) is 96.0-104.0%.
Li
L
L
Department of Chemistry, Sichuan Union University, 610064 Chengdu.
Feng
Y
Y
Huang
G
G
D000536:Aluminum Hydroxide / Q000737:chemistry*; D002138:Calibration; D011232:Chemical Precipitation; D002857:Chromium / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013997:Time Factors
D002857:Chromium; D000536:Aluminum Hydroxide; D006108:Graphite