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(四)金的结晶紫光度法测定1、试剂(一般试剂从略)、FeCl_3·6H_2O:25%水溶液。NaH_2PO_4·2H_2O:25%水溶液。醋酸丁脂:分析纯或化学纯。树脂袋:用纱布打成5×5公分的小口袋,内装1克大于40网目的717阴离子交换树脂,然后将另一端开口封闭。2、分析手续取20～50克样品于250毫升锥形瓶中,加1∶1王水(用工业纯盐酸、硝酸配制)40～60毫升,在电炉上煮沸10～15分钟,加40～50℃热水约100毫升,放入一个树脂袋,塞好瓶口,震荡15分钟,取
(D) gold crystal violet spectrophotometry 1, reagents (general reagents omitted), FeCl 3 · 6H 2 O: 25% aqueous solution. NaH 2 PO 4 · 2H 2 O: 25% aqueous solution. Butylacetate: Analytical or chemically pure. Resin bag: Use gauze to make a 5 x 5 cm small pouch containing 1 g of 717 anion exchange resin larger than 40 mesh, then close the other end. 2. Analytical procedures Take 20 ~ 50 g samples in 250 ml Erlenmeyer flask, add 40 ~ 60 ml of 1: 1 aqua regia (prepared with industrial pure hydrochloric acid and nitric acid), boil for 10 ~ 15 minutes on the electric stove, add 40 ~ 50 ℃ hot water about 100 ml, into a resin bag, plug the bottle, shock 15 minutes, take