流动注射示差动力学化学发光法测定微量硅

Determination of Trace Silicon by Flow Injection/Differential Kinetic Chemiluminescence Method

根据硅钼杂多酸氧化Luminol产生化学发光的性质，以及硅钼杂多酸与磷钼杂多酸 形成速率的差异，采用停流技术，在硅、磷共存时，不经分离，实现了对水样和钢样中硅的选择 性测定。该法检出限为2．0×10-8g／mL，线性范围1．0X10-7～1．0X10-5g／mL；相对标准 偏差为 2.8％（硅浓度 1.0× 10-6g／mL,n=11）.

A flow injection/chemiluminescence method with stopped-flow technique for se- lective determination of silicon is established. This method is based on the chemiluminesence reaction of 1: 12 molybdosilicate and luminol and the difference between the formation rate of molybdosilicate and molybdophosphate. The detection limit is 2.0 ×10-8 g/mL and the linear range is 1.0× 10-7~1.0× 10-5 g/mL. The relative standard deviation for 11 determi- nations of 1.0×10-6g/mL silicon is 2.8%.