有机肥中钴含量测定方法的验证

Puji Kurniawati, T. E. Purbaningtias, Bayu Wiyantoko, Ganissintya Dewi
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引用次数: 0

摘要

对有机肥中微量元素钴进行了测定。采用SNI 19-7030-2004对生活垃圾堆肥中钴含量的分析方法进行了改进。采用65%硝酸和高氯酸湿灰化法制备样品。湿灰化使用凯达管12小时。采用原子吸收光谱法测定钴含量,波长为λ = 240.7 nm。使用的验证参数为线性度、检出限(LOD)、定量限(LOQ)、精密度和准确度。固体有机肥中钴含量为10.32±4.06 mg/kg。线性选择钴标准溶液为0 ~ 5 mg/L,建立R2 = 0.9971的回归方程。本研究的检出限和定量限分别为0.015和0.029 mg/L。采用重复性法计算精密度,结果% RSD = 1.21%(≤2%)。准确度采用加标基质回收率。6次重复的平均回收率为90.7%(85 ~ 115%)。该方法的验证参数均在可接受范围内,可作为固体有机肥中钴含量测定的常规方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analytical method validation for cobalt determination on organic fertilizer
Cobalt determination has been carried out as one of the micro elements in organic fertilizer. The analytical method for the determination of cobalt used SNI 19-7030-2004 about compost from organic domestic waste that has been modified. Sample preparation was carried out by the wet ashing method using 65% nitric acid and perchloric acid. The wet ashing was using the Kjedhal tube for 12 hours. Cobalt determination was carried out using the AAS instrument at λ = 240.7 nm. Validation parameters used were linearity, Limit of Detection (LOD), Limit of Quantitation (LOQ), precision and accuracy. Cobalt content in solid organic fertilizer was 10.32±4.06 mg/kg. Linearity used cobalt standard solution of 0 – 5 mg/L and it produced regression equation with R2 = 0.9971. The Limit of Detection (LOD) and the Limit of Quantitation (LOQ) in this study were 0.015 and 0.029 mg/L. The precision was calculated by the repeatability method with the result of% RSD = 1.21% (≤2%). Accuracy used recovery of spiked matrix. The average% recovery result from 6 repetitions is 90.7% (85-115%). All the validation parameters of the method are in the acceptability range so that this modification method can be used as a routine method in determining cobalt levels in solid organic fertilizer.
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