硫酸盐的测定(edta滴定法)（Determination of sulfate (EDTA titration)）.docVIP

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硫酸盐的测定(edta滴定法)（Determination of sulfate (EDTA titration)）.doc

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硫酸盐的测定(edta滴定法)（Determination of sulfate (EDTA titration)）

硫酸盐的测定(edta滴定法)（Determination of sulfate (EDTA titration)） This article is contributed by 324ok3h4ew DOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Peoples Republic of China industry standard Determination of sulfate Titration method (EDTA titration) (EDTA titration) SL85 - SL - 1994 Determination, of, sulfate (EDTA, titration, method) 1995 / 05 / 01 approved by the Ministry of water resources / 1995 / 05 / 01 implementation / / / 1 General Provisions 1.1 subject content this standard specifies the use of EDTA complexometric titration for the determination of sulfate in water. 1.2 scope of application of this method is applicable to sulfate (SO42 -) in the natural water content of 10 ~ 200mg / L range. But diluted or concentrated, it can expand the scope of application. 1.3 interference and elimination of all the metal ions affecting the determination of magnesium ions interfere with the titration of sulfate. Cyanide can minimize the interference of zinc, lead and cobalt; when aluminum, barium, lead and manganese are disturbed by the plasma, they need to be measured by gravimetric or spectrophotometric methods. 2 methods principle The barium sulfate is first precipitated with an excessive amount of barium chloride. Excess barium in the ammonia buffer medium of pH is 10, with chromium black T as indicator, adding a certain amount of magnesium, titration with EDTA two sodium (EDTA two sodium) salt solution. From the addition of barium and magnesium to the EDTA solution The amount of barium consumed in the barium sulfate and the amount of EDTA consumed by the residual barium and magnesium can be obtained by subtracting the amount of barium consumed by the sulfate after precipitation, thus indirectly obtaining the sulfate content. The calcium and magnesium in water samples also consume EDTA at the same time, and the amount of EDTA solution consumed by calcium and mag