尼泊尔耕地土壤中电解液法测定蒸馏水pH值的评价

D. Khadka, R. Amgain, S. Joshi, S. Shrestha
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引用次数: 0

摘要

土壤pH值是土壤化学实验室最常用的测量参数。虽然我们从一开始就只使用蒸馏水,但有各种各样的pH测量方法。在尼泊尔,没有显示方法性能的数据库。三种方法分别是;采用水、氯化钾和氯化钙的土液比(1:1、1:2和1:2.5)。总共115个样本是在尼泊尔山区和terai地区0-20 cm的深度随机采集的。采集的样品分别按照上述方法进行分析。进行各种统计检验(f检验、平均分离、相关性和回归模型)进行比较。此外,还计算了将H2O与电解质法关联的模型验证参数。本文采用了线性、二次和三次三种模型。结果表明,在整个比例中,不同方法对pH测量的影响有显著差异。pHH2O比pHCaCl2在1:1、1:2和1:2.5比例下分别高0.57、0.56和0.67个单位。而分别比pHKCl高1.24、0.99和0.95个单位。在测量过程中达到稳定的时间顺序为pHH2O(89.44秒)> pHCaCl2(54.29秒)> pHKCl(33.08秒)。同样,相关的二次模型和三次模型在预测pHCaCl2和pHKCl时表现出几乎相同的性能(较低的RMSE、MAE和较高的R2和d)。确定的数据库可用于比较在尼泊尔环境下使用的三种不同的土壤pH测量方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of distilled water pH measurement with electrolyte methods in cultivated soils of Nepal
Soil pH is most routinely measured parameter among all others in soil chemistry laboratory. There are various methods developed for pH measurement, although we using only distilled water from the beginning. In Nepal, there do not have database for showing performance of the methods. The three methods namely; H2O, KCl and CaCl2 with their soil:solution ratios (1:1, 1:2 and 1:2.5) were used. The total 115 samples were collected randomly at a depth of 0-20 cm from the hill and terai regions of Nepal. The collected samples were analyzed following mentioned methods, separately. The various statistical tests (F-test, mean separation, correlation, and regression model) were performed for comparison. Moreover, model validation parameters were also calculated for relating H2O with electrolyte method. The three models linear, quadratic and cubic were used for this task. The result revealed the effect of methods on pH measurement was significantly different in the entire ratio. The pHH2O was 0.57, 0.56 and 0.67 units higher than pHCaCl2 in 1:1, 1:2 and 1:2.5 ratios, respectively. Whereas, 1.24, 0.99 and 0.95 units higher than pHKCl in respective ratio. Moreover, regarding timing to reach stable during measurement were in the order pHH2O (89.44 sec) > pHCaCl2 (54.29 sec) > pHKCl (33.08 sec). Similarly, relating modeling quadratic and cubic model showed nearly equal performance (lower RMSE, MAE and higher R2 and d) for predicting pHCaCl2 and pHKCl from the pHH2O in each soil solution ratio. The determined database can be useful for comparing used three different methods of soil pH measurement under Nepalese context.
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