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采用连续流动分析仪测定磷矿中的P_2O_5含量。结果表明,ρ(P_2O_5)在0~400μg/mL内与吸光度具有良好的线性关系,相关系数r=0.999 4,与国家标准方法测定结果无显著偏差。测定结果的最大绝对偏差为0.24%,相对标准偏差为0.30%,加标回收率为98.4%~104.7%,可以满足磷矿中P_2O_5含量快速测定的要求。
Determination of P_2O_5 in phosphate rock by continuous flow analyzer. The results showed that there was a good linear relationship between ρ (P_2O_5) and absorbance in the range of 0 ~ 400 μg / mL with a correlation coefficient r = 0.999 4, which showed no significant deviation from the national standard method. The results showed that the maximum absolute deviation was 0.24%, the relative standard deviation was 0.30% and the recoveries were 98.4% -104.7%, which can meet the requirement of rapid determination of P_2O_5 content in phosphate rock.