载炭泡塑分离富集－火焰原子吸收法测定金

Flame AAS Determination of Gold after Concentration and separation by Polyurethane Foam Loaded with Active Carbon

用载炭泡塑从５％～３０％的王水介质中吸附富集５～１０００μｇＡｕ，经无臭灰化和王水浸提，Ａｕ的回收率大于９９％。方法用于含Ａｕ量较高的矿石分析时，效果较泡塑吸附好。用火焰原子吸收法测定含Ａｕ６．８０ｇ／ｔ的金标样，验证分离富集方法的可靠性，结果平均值为６．７２ｇ／ｔ，相对标准偏差（ｎ＝１１）为３．１％。

old is adsorbed on a polyurethane foam loaded with active carbon from a 5%～30%aquaregia medium and is leached with aqua regia after ashing,a recovery of >99%is obtained.For samples richer in gold,the method is better than adsorption on a polyurethane foam. For thedetermination of gold in a standard sample containing 6.80g/t Au,the average of 11 results is6.72g/t with a 3.1% RSD.