矿石中低含量钙的化学分析法困难颇多.用乙炔-空气火焰的原子吸收法干扰也不少,且灵敏度不高.我们采用磷酸溶样后,在氧化亚氮-乙炔火焰中测定钙.方法干扰少、结果准、灵敏度高(SCa=0.0078),而且耗锶量少,尤其适于低含量钙的测定. There is a lot of difficulty in the chemical analysis of low-level calcium in ores, and there is also a lot of interference with the acetylene-air flame atomic absorption method, and the sensitivity is not high.We measured the calcium in the nitrous oxide-acetylene flame after dissolving it with phosphoric acid. The method has less interference, accurate result and high sensitivity (SCa = 0.0078), and less strontium is consumed, which is especially suitable for the determination of low content of calcium.