摘要:
为了准确高效地测定地表径流中硫酸根含量,该试验探讨阿拉伯胶稳定剂用量、加入酸量、氯化钡状态等对硫酸钡比浊体系的影响。结果表明,加入0.25%阿拉伯胶1.5 mL,加入0.5%硝酸溶液0.5 mL,加入氯化钡颗粒0.2 g,待测液摇匀静置15~60 min,阿拉伯胶稳定剂存放30 d,线性范围在0~8 mg/L,R2为0.999,线性良好。实际检测样品的变异系数< 12%,回收率在90%~110%之间,检测结果的精密度与准确性较高。与国标方法及其他改进方法相比,该试验方法操作简单,检测高效准确,适用于批量水样的硫酸根含量的测定。
Abstract:
With the aim at determination of the sulfate content in forest surface runoffs accurately and efficiently, the effects of the amounts of Arabia gum stabilizer and acid and Barium chloride state on the stability of barium sulfate dispersion system were discussed. The results showed that under the conditions that the mount of Arabia gum stabilizer of 0.25% was 1.5 mL, the mount of nitric acid of 0.5% was 0.5 mL, the mount of Barium chloride crystal was 0.2 g, the storage time of the solution to be determined was between 15~60 min, and the storage time of Arabia rubber stabilizer was less than 30 days, the standard curve was ranged between 0 and 8 mg/L with a good linear relation of R2=0.999. The precision of variation was less than 12%, the recoveries were in the range of 90~110%, and the precision and accuracy of the test results were relatively higher. Compared with the national standard method and other improved methods, the test method was simple, efficient and accurate, and suitable for the determination of sulfate content in batch water samples.
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