分光光度法直接测定油田水样交联剂中的铬

Direct chromium determination of cross linking agent in water from oilfield by spectrophotometry

研究了用过硫酸铵做氧化剂,将油田水样交联剂中的Cr3+氧化为Cr6+,然后用二苯碳酰二肼分光光度法直接测定的最佳条件。方法回收率93%以上,方法精密度(RSD%)平均3.9。取(2～3)mL水样时,过硫酸铵的最佳用量为0.4g。经对胜利油田水样的测定,并与原子吸收光度法对照,结果令人满意。

Chromium （Ⅲ） in cross Linking agent of water from oilfield was oxidized to Chromium （Ⅵ） by oxidant ammonium persulfate, and chromium was determined with 1,5 -diphenylcarbohydrazide spectrophotometry method. Then testing conditions of this method were detail investigated. The experimental results showed that recovery of this approach was larger than 93 %, and its average precision expressed with RSD was 319 %. The optimum amount of oxidant was 0.4 g for 2 mL-3mL water. From application test for water from ShengLi oilfield and result comparisons with AAS, this approach was proved to be very useful for chromium determination of cross Linking agent in water from oilfield.