光度法测定压裂返排液中硼酸的含量

Study on methods of spectrophotometric determination of boric acid in fracturing flowback fluid

压裂施工完成后会产生大量的压裂返排液,将其简单处理后再次用于压裂液的配制,不仅可以节约处理废水的成本,还可以避免污染环境、浪费水资源。准确测定其中硼酸的含量,对消除返排液中硼酸的影响、成功重复利用返排液具有重要意义。实验探索了萃取-紫外分光光度法并筛选了关键的实验条件,其次还探索了姜黄素可见分光光度法。实验结果表明:两种方法都能够准确测定返排液中硼酸的含量,其中姜黄素可见分光光度法每次需配制新鲜的姜黄素-草酸溶液,需对水样除去钙镁且显色后还要离心处理;相比来说萃取-紫外分光光度法操作方法更简单,共存离子对测定结果的干扰更小。

After fracturing operations there would produce a lot of fracturing flowback fluid,and if it was used to prepare fracturing fluids after simple processing,that can not only save the costs of sewage treatment,but also avoid environmental polluting and water wasting. So accurate determination of the content of boric acid is .meaningful to eliminate the influence of boric acid and reuse of fracturing waste fluid successfully. The method of extraction-UV spectrophotometry and curcumin visible spectrophotometry were ex- plorod and the pivotal experimental conditions of extraetion-UV were filtered. Experimental results showed that both methods are able to accurately determine the content of boric acid, wherein the method of extracted-UV spectrophotometry is more simple and smaller coexisting ion interference compared to method of cureumin visible spectrophotometry, because the latter needs to prepare fresh cureumin-oxalic acid solution and centrifugation for the removal of calcium and magnesium.