[Determination of calcium and magnesium in wheat flour by suspension sampling-flame atomic absorption spectrometry].

Suspension sampling technique was applied to flame atomic absorption spectrometry and was successfully used to determine calcium and magnesium in wheat flour. The wheat flour was suspended in agar sol containing dibutyl phthalate and made into suspension. Choice of suspension agent and elimination of chemical interference were studied. The test solution was injected into air-acetylene flame to determine calcium and magnesium by standard addition method. Determination results were consistent with those obtained by ashing method. The t-test showed that no difference was found between the two methods. Displacement of ashing method by suspension sampling method for the sample pretreatment is possible. This method is convenient, rapid and accurate.