近红外光谱用于土壤锌的快速分析及其稳定性  被引量:3

Near-infrared Spectroscopy Applied to Rapid Analysis of Zinc in Soil and Its Stability

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作  者:杨亚娜[1] 潘涛[1,2] 李敏妙 姚立军[1] 

机构地区:[1]光电信息与传感技术广东普通高校重点实验室(暨南大学),广州510632 [2]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京21000

出  处:《科学技术与工程》2014年第4期150-152,156,共4页Science Technology and Engineering

基  金:国家自然科学基金(61078040);土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)开放课题基金(0812201201)资助

摘  要:利用近红外(NIR)光谱结合偏最小二乘(PLS)回归研究珠三角农田土壤锌含量的无试剂快速定量分析方法,基于定标集、预测集的多次划分讨论模型的稳定性。将全部扫描谱区(400~2498nm)分成可见区(400~780nm)、短波近红外区(780~1100nm)、长波近红外区(1100~2498nm)和全近红外区(780—2498nm)。经过比较、检验,长波近红外区达到最好的模型效果和稳定性,其最优PLS因子个数为8,检验集的预测均方根偏差(V-SEP)和预测相关系数(V-Rp)分别为78.847mg/kg-1和0.731。结果表明,长波近红外光谱可以应用于土壤锌含量的无试剂快速定量分析。Near-infrared (NIR) spectroscopy combined with the partial least squares (PLS) regression was used to establish a rapid no-reagent quantitative analysis method for the content of zinc in the farmland soil samples from Pearl River Delta. The modelling stability was discussed based on varied partitioning of the calibration and prediction sets. The overall scanning region (400 -2 498 nm) was separated into the visible (400 - 780 nm), the short-wave NIR (780 -1 100 nm), the long-wave NIR (1 100 -2 498 nm), and the overall NIR (780 -2 498 nm) regions. By comparison and validation, the results indicated that the long-wave NIR region had the best pre-diction accuracy and stability, and the optimal number of PLS factors was 8, the root mean square error (V-SEP) and the correlation coefficient of prediction ( V-Rp ) in the validation set were 78. 847 mg/kg and 0. 731, The results show that long-wave NIR spectroscopy can be applied to the rapid no-reagent quantitative analysis of the content of zinc in soil.

关 键 词:土壤  长波近红外 偏最小二乘 稳定性 

分 类 号:O433.4[机械工程—光学工程] S151.9[理学—光学]

 

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