[Determination of calcium and magnesium in human hair by non-complete digestion-flame atomic absorption spectrometry].

Under low temperature of 80-130 degrees C human hair sample is digested by concentrated nitric acid and hydrogen peroxide up to solution present transparent pale brown. The fat and oil produced from digestion of hair sample are solved by emulsifier OP added in the solution, a homogeneous emulsion is gained. Test solutions prepared by adding releasing agent La(III) and agar solution in appropriate amount of the emulsion are injected into air-acetylene flame and the working curve method is used to determine. Condition of digestion, elimination of interference and the detection limit are studied. Determination results are consistent with those obtained by ashing method. The relative error between them is less than +/- 0.5%. This method is convenient, rapid and accurate.