The sample is decomposed by sodium hydroxide,then extracted by the hot water.Part of solution was determined in zincous concentrate in H 2SO 4 medium by molybdenum blue spectrophotometry.

• 用氢氧化钠熔融试样,以水浸出熔融物,分取部分试液于硫酸介质中,用硅钼蓝光度法测定锌精矿中二氧化硅的含量。