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1.在大量硫酸盐存在时,NO_3~-在0.1M KCl—2·10~(-4)M UO_2Ac_2—10~(-2)M HCl底液中的催化电流随硫酸盐浓度的增大而降低;半波电位则逐渐向更负的电位移动。2.NO_3~-在0.1M S_rCl_2—2·10~(-4)M UO_2Ac_2—10~(-2)M HCl 底液中的id/(Cm~2/_3t~1/6) 值和半波电位都与前述底液接近或一致。S_rCl_2浓度增大,催化电流降低,半波电位向更正的电位移动。3.以01M S_rCl_2为支持电解质时,可以消除大量硫酸盐的干扰,从而可使本法用于硫酸盐中硝酸盐杂质的测定,操作手续简单、快速,所得结果,与蒸馏——比色法一致。
In the presence of a large amount of sulfate, the catalytic current of NO_3 ~ - in 0.1M KCl-2 · 10 ~ (-4) M UO_2Ac_2-10 ~ (-2) M HCl bottom solution increases with the sulfate concentration Lower; half-wave potential is gradually moving to a more negative potential. The value of id_ (Cm ~ 2 / _3t ~ 1/6) and the half wave of NO_3 ~ - in 0.1M S_rCl_2-2 · 10 ~ (-4) M UO_2Ac_2-10 ~ (-2) Potential and the bottom of the liquid close to or consistent. S_rCl_2 concentration increases, the catalytic current decreases, half-wave potential to a more positive potential shift. When using 01M S_rCl_2 as electrolyte, it can eliminate the interference of a large amount of sulfate, so that this method can be used for the determination of nitrate impurity in sulfate. The operation procedure is simple and fast, and the result is in good agreement with distillation- Consistent.