Liu Xue-Yan, Li Wei, Yu Kang, Fan Zhi-Yu, Luo Bin, Nie Deng-Pan, Luo Ying-Chun, Dai Yi, Wang Hao
School of Chemical Engineering, Guizhou Minzu University, Guiyang, P. R. China.
Technology Center, China Tobacco Yunnan Industrial Co. Ltd., Kunming, P. R. China.
J Sep Sci. 2023 Jan;46(1):e2200656. doi: 10.1002/jssc.202200656. Epub 2022 Nov 14.
This paper reports a method for determining the carbonate content in barite ore using headspace gas chromatography. Based on the acidification reaction, the carbonate in the barite ore was converted to CO in a closed headspace vial. When the carbonate content was significant, the pressure caused changes in the CO and O signals and affected the measurement accuracy. It was found that carbonate content is proportional to the intensity ratio of the CO to O signals. Thus, the carbonate content in barite ore can be measured indirectly using a theoretical model. The results showed that the carbonate in 3 g of barite ore sample with a particle size of 74 μm could react completely with a hydrochloric acid solution (2 mol/L) at 65°C for 5 min. The method described herein had good precision (relative standard deviation < 4.14%) and accuracy (relative differences < 6.12%). Further, the limit of quantification was 0.07 mol/L. Owing to its simplicity and speed, this method can be used for the batch determination of carbonate content in barite ore.
本文报道了一种采用顶空气相色谱法测定重晶石矿中碳酸盐含量的方法。基于酸化反应，重晶石矿中的碳酸盐在密闭的顶空瓶中转化为CO。当碳酸盐含量较高时，压力会导致CO和O信号发生变化，影响测量精度。研究发现，碳酸盐含量与CO和O信号的强度比成正比。因此，可使用理论模型间接测定重晶石矿中的碳酸盐含量。结果表明，3 g粒径为74 μm的重晶石矿样品中的碳酸盐能在65℃下与2 mol/L盐酸溶液完全反应5 min。本文所述方法具有良好的精密度（相对标准偏差<4.14%）和准确度（相对差异<6.12%）。此外，定量限为0.07 mol/L。由于其操作简单、速度快，该方法可用于批量测定重晶石矿中的碳酸盐含量。
