Trace cadmium in the sodium salt reagents of NaBO2. 4H2O,NaOAc,Na2CO3 and Na2HPO4l2HzO was determined by flame atomic absorption after separating and enriching with surmydryl cot-ton.

• 偏硼酸钠、无水乙酸钠、无水碳酸钠、磷酸氢二钠等试剂中的痕量镉，经巯基棉分离和富集后，以火焰原子吸收光谱法进行测定。