火焰原子吸收法测定磷矿石、磷酸中铬

研究了火焰原子吸收光谱法测定磷矿石、磷酸中铬的方法,磷矿石试样经消解液溶解,磷矿石试液、磷酸试液分别以盐酸和硝酸为介质,加入一定量KCl溶液,于波长357.9nm处测量试样吸光值,由标准加入曲线得出铬含量。本方法磷矿石与磷酸样品的加标回收率分别为96.2~104.6%和97.4~105.9%,磷矿石与磷酸样品的相对标准偏差分别为1.97%~3.16%和3.86%~5.28%,精密度和准确度较高。

Flame Atomic Absorption Spectrometry for Determination of Chromium in Phosphorus and Phosphoric Acid

The method for determination of chromium in phosphate ore and phosphoric acid by flame atomic absorption spectrometry was studied. Phosphate rock sample was dissolved in Lye nitrate solution,a certain amount of KCl solution was added to the test solution of phosphate rock and phosphoric acid with hydrochloric acid and nitric acid as the medium respectively,the samples' absorbance values were measured at a wavelength of 357. 9nm,and the chromium content was obtained by the standard addition curve. The phosphate rock and phosphoric acid samples spiked recoveries of this method are between 96. 2 ~ 104. 6%,and97. 4 ~ 105. 9% respectively,the relative standard deviation of phosphate rock and phosphate samples were1. 97- 3. 16% and 3. 86%- 5. 28%,this method is of high precision and accuracy.