The excess tin chloride addition produces black mercury precipitation and is about to seriously affect the determination of iron by using potassium chromate volumetric analysis method.
重铬酸钾容量法测铁中，二氯化锡超量产生黑色汞沉淀，严重影响测定。
2
The country is rich in minerals such as bauxite, iron ore, lead, gold, precious stones, tin, chromate, anthracite, granite, marble, clay, white sand and graphite.