摘要
建立气相色谱法测定有机肥料中水分含量的方法。样品在N,N-二甲基甲酰胺中超声提取,采用porapad-Q多孔高分子小球不锈钢填充柱(1 m×4 mm,177~250μm)为分离色谱柱,加入甲醇作为内标物,以热导检测器检测,内标法定量。结果表明,样品提取液中水的含量在0.00~77.85 mg/g范围内与色谱峰面积呈良好的线性关系,相关系数为0.9996。样品测定结果的相对标准偏差为0.79%~3.98%(n=7),加标回收率为95.3%~101.3%。该方法准确度高,重现性好,适用于有机肥料中水分含量的定量分析。
A method was established for determining water content in organic fertilizer by gas chromatography with thermal conductivity detector.The samples were extracted in N,N-dimethyl formamide by ultrasound.The porapad-Q stainless steel chromatographic column packed with porous polymer microsphere(1 m×4 mm,177-250μm)was used as the separation column.Methanol was added as the internal standard for detection by thermal conductivity detector.The results showed that the water content had a good linear relationship with chromatographic peak area in the range of 0.00-77.85 mg/g,the correlation coefficient were 0.9996.The relative standard deviations of determination results of samples were 0.79%-3.98%(n=7),and the recoveries were 95.3%-101.3%.The method has high accuracy and good reproducibility,which is recommended for the quantification of water content in organic fertilizer.
作者
甘合智
张海殷
李福
Gan Hezhi;Zhang Haiyin;Li Fu(Guangxi Zhuang Autonomous Region Testing Institute of Product Quality,Nanning 530000,China)
出处
《化学分析计量》
CAS
2021年第11期55-58,共4页
Chemical Analysis And Meterage
关键词
有机肥料
水分含量测定
气相色谱法
organic fertilizer
determination of water content
gas chromatography
