Recent method of synthesizing 3,5-xylenol is sulpho alkaline fusion of dimethylbenzene,it is a very complicated procedure with serious pollution and low-pure products.

国内目前生产工艺是间二甲苯的磺化碱法,方法工艺过程复杂、污染严,并且产品纯度不高。

By using sulpho acid to dissociate samples, using spectrophotometric method to determine micro-chrome in drainage sedimentary is very easy and simple with low cost.

采用王样品,光光度法测定系沉积物样品中微量铬,方法简便,易操作,成本低。