分光光度法测定轻质碳酸钙中硝酸根含量  

Determination of nitrate ions content in light calcium carbonate by spectrophotometry

作　　者：贾洪秀[1] 朱云勤[1] 朱必学[1] 朱纯[1] 刘健[1] 李令[1] 孟铁宏[1] 

机构地区：[1]贵州大学化学工程学院,贵州贵阳550025

出　　处：《无机盐工业》2010年第5期53-55,共3页Inorganic Chemicals Industry

摘　　要：轻质碳酸钙中含有杂质硝酸根,其含量是影响轻质碳酸钙产品质量的一个重要指标,用水杨酸钠分光光度法测定轻质碳酸钙中的硝酸根,建立了一个简单、快速、选择性好的轻质碳酸钙产品中硝酸根的测定方法。在410 nm波长处,硝酸根质量浓度在0.50~2.50 mg/L时与水杨酸钠吸光度呈线性关系,线性回归方程为y=0.102 2x＋0.002 7,r=0.999 35,相对标准偏差优于10%,加标回收率在93%~104%,可用于测定轻质碳酸钙产品中硝酸根含量,操作简单,可行性强,可以满足测定要求,应用于实时监控。Nitrate are contained in light calcium carbonate,whose content is an important index influencing the quality of light calcium carbonate.Using sodium salicylate-spectrophotometry method,a simple and fast method with good selectivity for determination of nitrate content in light calcium carbonate was established.When visible absorbance was detected at a wavelenth of 410 nm and concentration of nitrate at 0.50~2.50 mg/L,nitrate had a linear relationship with absorptance of sodium salicylate.Equation of linear regression was y=0.102 2x＋0.002 7,r=0.999 35.Relative standard deviation was better than 10%,and standard addition recovery was 93%~104%.This method can be applied in real-time monitoring as its determination is simple,feasible,and satifactory for results.

关 键 词：分光光度法 轻质碳酸钙 硝酸根 水杨酸-水杨酸钠溶液 

分 类 号：TQ132.32[化学工程—无机化工]