锌盐共沉淀石墨炉原子吸收光谱法测定水质中Cr^(+6)  

Determination of Cr^(+6) in Water by Zinc Salt Co-precipitation GFAAS Method

作　　者：刘洪升[1] 周聪[1] 

机构地区：[1]中国热带农业科学院分析测试中心,海南儋州571737

出　　处：《热带农业科学》2002年第6期29-32,共4页Chinese Journal of Tropical Agriculture

摘　　要：进行了用石墨炉原子吸收光谱分析法测定液体食品(饮用品)中Cr+6的技术研究。结果表明:在样品溶液中加入氢氧化锌沉淀剂,调节pH为8～9,可使氢氧化锌与Cr+3离子形成共沉淀,从而有效地分离样品溶液中的Cr+3;再用石墨炉原子吸收光谱仪测定水质中的Cr+6。这样,不仅消除了Cr+3离子的干扰,而且可利用石墨炉2700℃高温原子化的特性,使各种基体干扰物质在铬元素原子化之前挥发殆尽,避免了仪器测定的背景干扰,从而大大提高了分析结果的准确性。Studies were made on determination of the Cr +6 in liquid food by GFAAS analyzing method.The precipitating agent zinc hydr oxide was put into the sample solution,and the pH was adjusted to8-9.The C r +3 precipitated together with the zinc hydroxide.Thus,the Cr +3 in the sam ple solution was effectively separated.Then the Cr +6 in the water was determined using GFAAS in strument.In this way,not only i nterference of the Cr +3 was eradicated,but also all the interfering substances evaporated before a tomization of chromium in the graphitic furnace of2700℃,and the background interference was avoided in the determi nation with instrument.Thus,the accur acy of the analyzing results was greatly increased.

关 键 词：石墨炉原子吸收光谱法 水质测定 锌盐共沉淀 铬 

分 类 号：X832[环境科学与工程—环境工程]