CAJ | 학술논문

用碳酸钠将硫酸钙样品中的钙沉淀为碳酸钙，释放出硫酸根，用阴离子型离子色谱仪，在40℃柱温下，以6.3 mmol／L NaHCO3–1.7 mmol／L Na2CO3缓冲盐为淋洗液，采用电导检测器测定其中硫酸根的浓度，以间接得到硫酸钙含量。实验结果表明，该法与经典的沉淀重量法测定结果相吻合，两者之间的相对误差为0.29%。样品加标回收率在96.0%～105.3%之间，测定结果的相对标准偏差为0.26%（n=6）。该方法精密度与准确度高，可快速、稳定、可靠地分析脱硫灰渣及石膏样品中的硫酸根含量。
용탄산납장류산개양품중적개침정위탄산개，석방출류산근，용음리자형리자색보의，재40℃주온하，이6.3 mmol／L NaHCO3–1.7 mmol／L Na2CO3완충염위림세액，채용전도검측기측정기중류산근적농도，이간접득도류산개함량。실험결과표명，해법여경전적침정중량법측정결과상문합，량자지간적상대오차위0.29%。양품가표회수솔재96.0%～105.3%지간，측정결과적상대표준편차위0.26%（n=6）。해방법정밀도여준학도고，가쾌속、은정、가고지분석탈류회사급석고양품중적류산근함량。
Calcium sulphate in the sample was converted into calcium carbonate by using sodium carbonate,which released sulfate ions into solutions. The released sulfate ions were determined by an conductivity detector with anionic ion chromatography at 40℃,with the buffer of 6.3 mmol/L NaHCO3–1.7 mmol/L Na2CO3 solution. It was found that the result obtained by the anionic ion chromatography was very close to that obtained with the classic precipitation method, and the relative error between the two methods was only 0.29%. The new method yielded recoveries between 96.0% and 105.3% with RSD of 0.26% (n=6). The method can determine thecontent of sulfate in the sample of the desulfurization ash and gypsum,with high precision and accuracy,as well as being fast,stable and reliable.