磷锑钼蓝分光光度法测定地球化学样品中的磷

Spectrophotometric Determination of phosphorus by use of Molybdoantimonylphosphate Blue

磷钼蓝分光光度法广泛用于合金、矿石等样品中磷的测定,加入锑盐后,测定的灵敏度得到进一步提高,但一般都采用单独取样酸分解进行。作者曾用于铁矿石中磷的测定。 本文采用过氧化钠—氢氧化钠在银坩埚中熔融分解样品,于同一份溶液中测定磷同时测定钨、钼、钒、硼和氟。拟定的方法用于标样和样品中磷的测定,结果满意。

The sample is fused with, sodium hydroxide and sodium peroxide in a silver crucible. The heterpoly blue complex is formed in 0.20-0.40N H2SO4. Beer's law is obeyed in the range of 0-120μgP/100ml and the molar absorptivity for P is 1.58×104 L·mol-1·cm-1 at 700nm. The method has been applied to the determination of P in geochemical samples with good accuracy.