论文部分内容阅读
用二硫代安替比林甲烷(DTPM)测定砷,具有选择性好(能在磷酸或硫酸介质中直接显色)、灵敏度高(比萃取砷钼蓝法高20%)、简便快速(避免了用有机试剂萃取分离磷酸的操作)等优点.但该试剂能和包括铁在内的许多重金属离子作用,在显色液中,50mgNH_4~+,40mgFe~(2+),25mgAl,20mgMg、K,10mgCa、Na、SiO_3~(2-),3mgNO_3~-,2mgSn~(4+),1mgCo~(2+)、Ni~(2+)、Mn~(2+)、Li~+、Sr~(2+),0.5mg Zn~*,0.3mg Fe~(3+)、Cd~(2+*),0.1mg Cu~(2+*)、Mo(Ⅵ)、Cr~(3+)、Ba~(2+)、Ti~(4+)、V~(4+)、Pb_~(2+)等元素,不干扰
Arsenic determination with DTPA (DTPM) has good selectivity (direct color development in phosphoric acid or sulfuric acid medium), high sensitivity (up to 20% higher than arsenic molybdenum extraction), quick and easy (to avoid The use of organic reagents extraction and separation of phosphoric acid) operation, etc. However, the reagent and iron, including many heavy metal ions in the color liquid, 50mgNH_4 ~ +, 40mgFe ~ (2 +), 25mgAl, 20mgMg, K (2 +), Ni 2+, Mn 2+, Li +, Sr ~ (2+), Ca 2+, Mg 2+, (2 +), 0.5mg Zn ~ *, 0.3mg Fe ~ (3 +), Cd 2+, 0.1mg Cu 2+, Mo Ⅵ, Cr 3+, Ba ~ (2 +), Ti ~ (4 +), V ~ (4 +), Pb ~ (2+)