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首页> 外文期刊>Journal of the Indian Chemical Society >An improved method for the determination of chloride in iron ore, coal, coke, mill sludge, flue dust and sinter products by turbidimetry and validation of results obtained by indirect atomic absorption spectrophotometry
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An improved method for the determination of chloride in iron ore, coal, coke, mill sludge, flue dust and sinter products by turbidimetry and validation of results obtained by indirect atomic absorption spectrophotometry

机译：浊度法测定铁矿石，煤，焦炭，厂污泥，烟道粉尘和烧结矿产品中氯离子的改进方法，间接原子吸收分光光度法测定结果的验证

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摘要

An improved and rapid procedure for the determination of chloride in iron ore, mill sludge, coal, coke, flue dust and sinter products etc. has been developed by turbidimetry, and the results obtained were validated by indirect atomic absorption spectrophotometry (AAS) method. Chloride in these samples were leached by 10% (y/v) nitric acid and then determined by the above two methods. A correlation curve was plotted between the results obtained by the two methods, representing the efficacy of the proposed method vis-a-vis the AAS method. The correlation coefficient of the linear regression was 0.98, demonstrating that both the methods are complementary to each other. The different experimental parameters such as choice of leaching agent, leaching time, effects of diverse ions, concentration of nitric acid etc. were studied in detail. The accuracy of the method was ascertained by estimating chloride content in some Certified Reference Materials (CRM) like Syenite sample (SY/3) and iron ore sample (BAM No. ECRM 687-1). The chloride values obtained for the CRMs were in excellent agreement with the recommended values, indicating that the method yielded fairly accurate results. The detection limit was found 0.05 μg/ml (based on mean plus 3 times standard deviation of blank, n = 5) while the RSD was found in the range 1-3% depending on the concentration of the analyte. The advantages of the proposed method are a spectrophotometer has been used for turbidity measurement in terms of absorbance in line with turbidimetric measurement of sulphate ion and HNO3 has been used for leaching of chloride in stead of hot water.
机译：用比浊法建立了一种改进的快速测定铁矿石，磨机污泥，煤，焦炭，烟道粉尘和烧结矿产品等中的氯的方法，并通过间接原子吸收分光光度法（AAS）验证了所得结果。这些样品中的氯化物用10％（y / v）硝酸浸出，然后通过上述两种方法测定。在通过两种方法获得的结果之间绘制了相关曲线，代表了相对于AAS方法所提出的方法的有效性。线性回归的相关系数为0.98，表明这两种方法相互补充。详细研究了不同的实验参数，如浸出剂的选择，浸出时间，不同离子的影响，硝酸浓度等。该方法的准确性是通过估算某些认证参考材料（CRM）中的氯化物含量来确定的，这些材料包括Syenite样品（SY / 3）和铁矿石样品（BAM No. ECRM 687-1）。 CRM获得的氯离子值与推荐值非常吻合，表明该方法产生了相当准确的结果。检出限为0.05μg/ ml（基于平均值加空白的3倍标准偏差，n = 5），而RSD则在1-3％范围内，具体取决于分析物的浓度。所提出的方法的优点是，分光光度计已被用于浊度测量，其吸光度与硫酸根离子的浊度测量相一致，并且HNO3已被用于代替热水浸出氯化物。

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