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提出用氧瓶燃烧-光度法来测定有机物中硫含量的定量分析方法,在低硫酸根浓度范围内(4~25mg/l),在浓碱条件下MTB(甲基百里酚蓝)的吸光度与硫酸根浓度在460nm波长处呈正相关,而在600nm(或610nm)处Ba-MTB络合物的吸光度与硫酸根浓度呈负相关。该方法标准偏差低于0.5mg,/l.变异系数低于3%,回收率为95-107%。
The quantitative analysis method of sulfur content in organic matter by oxygen flask combustion spectrophotometry was proposed. Under the condition of low sulfate concentration (4 ~ 25mg / l), the absorbance of MTB (methyl thymol blue) Was positively correlated with the sulfate concentration at a wavelength of 460 nm, whereas the absorbance of the Ba-MTB complex was negatively correlated with the sulfate concentration at 600 nm (or 610 nm). The method standard deviation of less than 0.5mg, / l. The coefficient of variation is less than 3% and the recovery is 95-107%.