用次磷酸盐容量法测定白钨精矿中砷时,某些矿样可能由于矿石中残存的浮选药剂(如油酸钠)起着“保护”作用,在用次磷酸盐还原时,使高达0.5%的砷仍然不能以单体状态析出。本法改用硫酸—硫酸氢钾代替盐酸—氯酸钾分解试样后,由于破坏了 Determination of arsenic in scheelite concentrate by hypophosphite volumetric method may cause some mineral samples to play a “protective” role due to the remaining flotation reagents (such as sodium oleate) in the ore. When hypophosphite is used for reduction, As high as 0.5% of arsenic still can not be precipitated as a monomer. This Act instead of sulfuric acid - potassium hydrogen sulfate instead of hydrochloric acid - potassium chlorate decomposition of the sample, as destroyed