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测定水中Cl~-通常采用K_2CrO_4为指示剂的AgNO_3容量法。在一般天然水或一般地下热水中采用此法可获得满意的结果。但是对于高温地下热水,由于它的特殊性和成份的复杂性,所得结果往往远离其真实值。此时改用Hg(SCN)_2比色法进行测定可获得满意的结果。与离子色谱法比较所测结果基本一致。对于含Cl~-1—20mg/L范围的高温地下热水,取<15ml的水样于25ml容量瓶中,按硫氰酸汞比色法进行。文献报道,试样中的Br~-、I~-、S_2O_3~(2-)和NO_2~-对此法有干
Determination of Cl - in water - usually using K 2 CrO 4 as an indicator of the AgNO 3 volumetric method. Satisfactory results can be obtained by using this method in general natural or general underground hot water. But for high temperature underground hot water, due to its particularity and complexity of ingredients, the result is often far away from its true value. At this point switch to Hg (SCN) _2 colorimetric assay for satisfactory results. Compared with the ion chromatography measured results are basically the same. For hot geothermal water containing Cl ~ -1-20mg / L range, take <15ml of water sample in a 25ml volumetric flask and proceed by mercury thiocyanate colorimetry. Reported in the literature, the sample of Br ~ -, I ~ -, S_2O_3 ~ (2) and NO_2 ~ - this method is dry