盐析蒸馏富集水中挥发酚和芳胺的可行性研究

Researches on the feasibility of salting-out-distillation for the enrichment of volatile phenol and aniline in wastewater

pH值7.0±0.5时盐析蒸馏可同时分离富集污水中的挥发酚和芳胺。选用了六种盐进行实验,并对选用的不同盐的富集效果作了考察。筛选出最佳盐析剂为NaCl,250mL水样中NaCl投加质量为150g时效果最好。含苯酚和苯胺的水样仅需接取前1/5的馏出液,分体积中的回收率高达92.4%和91.5%,富集达20倍以上。该蒸馏方法可有效富集微量挥发酚和芳胺,在低浓度污水的测定中更具有优势。

When the pH value is 7.0 ± 0.5,salting-out and distillation can separate and enrich the volatile phenol and aniline in wastewater simultaneously. Six kinds of salts have been chosen for the experiment. The enrichment results of different kinds of salts have been investigated. The best kind of salt chosen is NaCl. 150 g of NaCl is used for 250 mL of water sample. The recovery rate of phenol and aniline can be as high as 92.4% and 91.5% respectively in the first 50 mL distillate. The enrichment rate is over 20 times. This method can enrich the volatile phenol and aniline effectively. It has more superiority, when they are determined in wastewater with low concentration.