Assam coal (India) contains in an average from 2 to 5% of total sulphur of which about 90% is found to be organic: sulphur. The present study deals both quantitatively and qualitatively with the sulphur groups present in Assam coals. The qualitative tests were carried out following the method of SELI~ ER and t (z~ aP 1) and ti* I~ R 2) who carried out investigation into the sulphur linkages in vulcanised rubber and petroleum sulphur compounds ...
![酚酞啉 [用于氧化还原反应指示剂]结构式](https://image.chemsrc.com/caspic/089/81-90-3.png)
