1. 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熔法,该方法工艺过程复杂、污染严重,并且产品纯度不高。
2. 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.
   采用王水分解样品,分光光度法测定水系沉积物样品中微量铬,方法简便,易操作,成本低。

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