| The standard provides the flame atomic absorption spectrophotometry for the determination of total chromium in soil. The detection limit is 5mg/kg (with 0.5g sample, digest and make solvent to 50ml). Chromium is active to produce high temperature resistance oxide. The atomization is susceptible to flame and flame apparatus height. Flame of deoxidizing nature is needed and a height of 10mm for observation is preferable. Ammonium chloride can be added to suppress the interference of coexisting ions like Fe, Co, Ni, V, Al, Mg and Pb. |
