摘要
为了快速测定水样中的微量Pb(Ⅱ),将生物染色剂孔雀绿(BG)浸渍在定量滤纸上制备成铅检测试纸并研究了试纸与Pb(Ⅱ)的反应条件。结果表明,在水样中依次加入抗坏血酸、KI和HNO3,调解其浓度分别为0.010、0.15和0.40mol·L-1,Pb(Ⅱ)与试纸上的生物染色剂孔雀绿反应生成绿蓝色的三元离子缔合物BG2[PbI4],该缔合物的颜色与水样中Pb(Ⅱ)浓度成正比,对Pb(Ⅱ)的检出限为0.50mg·L-1。水样中的一般干扰离子可用0.5%的半胱氨酸掩蔽。该试纸对Pb(Ⅱ)具有良好的选择性,测定重复性好、操作过程简便,完全可以满足水样中Pb(Ⅱ)的现场快速检测需要。
A test paper method for rapid determination of lead in water samples was proposed. The preparation of the test paper and it＇s application conditions were studied. The procedure of preparing the test paper was as follows： firstly, five pieces of mid-velocity quantitative filter papers were dipped into 100 milliliter working fluid of brilliant blue, a kind of biological dye, at the percentage concentration of 0.1% for 30 min, then dried without bright light and at last being cut into small pieces of 8 mm×6 mm, called lead test paper. Before the test paper being applied in lead determination, water samples had to be treated by aseorbie acid, potassium iodide and nitric acid in advance, the best concentrations of each were 0.010 mol·L^-1, 0.15 mol·L^-1 and 0.40 mol·L^-1 respectively. After some of the treated water samples were transmitted on the test paper, lead, potassium iodide and brilliant blue reacted on the paper to generate a green-blue associate complex and the depth of the color was positively correlated with lead concentration. The detection limit of the method was 0.50 mg·L^-1. The interfering ions could be covered by 0.5% eysteine. The test paper method was simple, rapid, selective and could be used to determine trace lead in natural water samples.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2006年第4期1006-1009,共4页
Journal of Agro-Environment Science
基金
国家"十五"科技攻关课题(2002BA516A05)
天津市科技发展计划项目(043114611)
天津市科技创新能力与环境建设平台项目(05SYSYJC2500)
关键词
生物染色剂
孔雀绿
试纸
铅
快速测定
水样
biological dye
brilliant green
test paper
, lead
rapid-detection
water sample
