论文部分内容阅读
食品样中砷的测定一般用银盐法,然而此法灵敏低操作繁琐,本法用氢化物原子吸收分光光度法测定食品中的砷则操作简便、快速、灵敏度高.方法灵敏度为0.8ng·ml~(-1),检出限为0.5ng·ml~(-1).1 试验部分1.1 仪器与试剂WYX-402型原子吸收分光光度计HCF氢化物发生器T型石英管砷标准溶液:100ng·ml~(-1)混合酸:硝酸+高氯酸(4+1)盐酸溶液:0.5mol·L~(-1)硼氢化钾:5g·L~(-1)还原剂:称取碘化钾15g、抗坏血酸10g溶解于离子水,定容至100ml.
Determination of arsenic in food samples generally use the silver salt method, however, this method is sensitive and low operation cumbersome, this method using hydride atomic absorption spectrophotometry for the determination of arsenic in food is simple, rapid, high sensitivity method sensitivity of 0.8ng ml -1, the detection limit was 0.5ng · ml -1 .1 Experimental 1.1 Instruments and reagents WYX-402 atomic absorption spectrophotometer HCF hydride generator T-type quartz tube arsenic standard solution: 100 ng · ml -1 mixed acid: nitric acid + perchloric acid (4 + 1) hydrochloric acid solution: 0.5 mol·L -1 potassium borohydride: 5 g · L -1 reducing agent: Potassium iodide 15g, ascorbic acid 10g dissolved in ionized water, constant volume to 100ml.