The author discussed the improvement on the determination of phosphorus contents by addition of bismuth nitrate in ammonium molybdophosphate to improve the sensibility,the results was satisfied.

• 煤中磷的测定方法通常采用磷钼蓝光度法;在该法基础上尝试加入了硝酸铋以提高灵敏度;结果令人满意。