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水中微量镉、铅的测定,双硫腙法要用大量氰化钾。5-Cl(Br)-PADAP-正己酸盐光度法测铅;结晶紫法和5-Br-PADAP光度法测污水中镉,均用萃取分离,空白值不稳定,操作也不便。我们用5-Br-PADAP显色,乳化剂OP增溶,对镉铅作了联合直接光度法的测定。操作简单,减少了氰化钾用量。经用于电镀废渣,合成地面水中微量镉和铅的测定,结果满意。一试剂镉(铅)标准溶溶:lmg·ml~(-1),分别称取1.0000克纯食属镉(铅),加硝酸(1+1)20毫升,加热溶解,煮沸驱除氧化氮,冷却,于量瓶中稀释至1000毫升。使用时用0.1N硝酸释成10/μg·ml~(-1)。 5-Br-PADAP溶液:0.02%乙醇溶液。乳化剂OP(聚乙二醇辛基苯基醚):10%(V/V)。氨性缓冲液(pH8):称取氯化铵50克溶于适量水
Determination of trace cadmium, lead in water, dithizone method to use a large amount of potassium cyanide. 5-Cl (Br) -PADAP-n-hexanoate photometric method for the determination of lead; crystal violet method and 5-Br-PADAP spectrophotometric method for the determination of cadmium in the wastewater, both extracted and separated, the blank value is unstable and the operation is inconvenient. We used 5-Br-PADAP color, emulsifier OP solubilization, cadmium and lead were combined direct spectrophotometric determination. Simple operation, reducing the amount of potassium cyanide. Used for electroplating waste, synthetic surface water cadmium and lead determination, the results are satisfactory. A reagent cadmium (lead) standard solution: lmg · ml -1, were weighed 1.0000 grams of pure cadmium (Pb), plus nitric acid (1 +1) 20 ml, heated to dissolve, boil away nitrogen oxide, cooling , Diluted to 1000 ml in a measuring flask. When used with 0.1N nitric acid release 10 / g · ml ~ (-1). 5-Br-PADAP solution: 0.02% ethanol solution. Emulsifier OP (polyethylene glycol octylphenyl ether): 10% (V / V). Ammonia buffer (pH8): Weigh 50 grams of ammonium chloride dissolved in water