摘要
为了提高硫酸钡比浊法测定硫含量方法的重复性和准确性,讨论了测定波长、聚乙烯醇及乙醇用量、酸度对硫酸钡分散体系稳定性的影响.实验确定分散体系中50 mg/g的聚乙烯醇和无水乙醇最佳用量分别为2.0mL和3.0 mL,pH控制在1.0.方法的RSD为0.48%(n=6).将硫酸钡比浊法用于膨胀石墨中硫含量的测定,得到了令人满意的结果.
To improve the repetition and veracity of the BaSO4 turbidimetric method in the detection of sul- fur, wavelength of source, dosage of 50 mg/g polyvinyl ethanol solution, ethanol and pH were discussed. Optimum condition was determined as follows： pH of the system was 1.0,2.0 mL of 50 mg/g polyvinyl alcohol solution and 3.0 mL ethanol was used to insure the formation of steady dispersing system. RSD of the method was 0.48 % with n = 6. The above method was employed to detect the sulfur content in expanded graphite sample, and the result was satisfying：.
出处
《河北师范大学学报（自然科学版）》
CAS
北大核心
2007年第4期503-505,513,共4页
Journal of Hebei Normal University：Natural Science
基金
河北省教育厅博士基金(2004402)
关键词
比浊法
稳定性
聚乙烯醇
乙醇
PH
turbidimetry
stability
polyvinyl ethanol
ethanol
pH
