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Sulfate sorption measured by a buffering index over a range of properties of soils from south Western Australia
Soil Research ( IF 1.2 ) Pub Date : 2020-01-01 , DOI: 10.1071/sr20005
G. C. Anderson

Sulfate sorption by the soil affects the rate of sulfate leaching, which impacts on the availability of soil sulfate for plant uptake. In Australia, plant-available sulfur is measured using 0.25 M KCl heated for 3 h at 40°C to extract soil sulfur (SKCl40). This paper describes a technique referred to as a sulfate buffering index (SBI), which provides a measurement of sulfate sorption. SBI when combined with the estimates of the q and b parameters of the Freundlich equation, can be used to define a sorption curve. The equation is S = acb – q; where S is the amount of sulfate adsorbed (mg S kg–1), c is the equilibrium concentration of sulfate measured in solution (mg S L–1) and a, b and q are coefficients that describe the soil sulfate sorption curve. Coefficients S and c were measured using six sulfate solution concentrations ranging from 0 to 250 mg S kg–1. The adsorption curve was fitted using the modified Freundlich equation including setting of b = 0.41 and q = SKCl40 using recently collected soil samples. The modified Freundlich a coefficient or SBI was calculated as SBI = (S + SKCl40)/c0.41; where S and c were determined using 50 mg S kg–1 of added sulfate. The SBI ranged within 1–40. The SKCl40 was related to SBI below a depth of 10 cm (r2 = 0.71) but not for the 0–10 cm soil layer where S sorption was minimal.

中文翻译:

通过缓冲指数测量的硫酸盐吸附对澳大利亚西南部一系列土壤性质的影响

土壤对硫酸盐的吸附影响硫酸盐浸出率,进而影响植物吸收土壤硫酸盐的有效性。在澳大利亚,使用 0.25 M KCl 在 40°C 下加热 3 小时以提取土壤硫 (SKCl40) 来测量植物可利用硫。本文介绍了一种称为硫酸盐缓冲指数 (SBI) 的技术,它提供了硫酸盐吸附的测量方法。SBI 当与 Freundlich 方程的 q 和 b 参数的估计值相结合时,可用于定义吸附曲线。方程为 S = acb – q;其中 S 是吸附的硫酸盐量 (mg S kg-1),c 是溶液中测量的硫酸盐平衡浓度 (mg SL-1),a、b 和 q 是描述土壤硫酸盐吸附曲线的系数。系数 S 和 c 使用六种浓度范围为 0 至 250 mg S kg-1 的硫酸盐溶液进行测量。使用修正的 Freundlich 方程拟合吸附曲线,包括使用最近收集的土壤样品设置 b = 0.41 和 q = SKCl40。修正的 Freundlich a 系数或 SBI 计算为 SBI = (S + SKCl40)/c0.41;其中 S 和 c 是使用 50 mg S kg-1 添加的硫酸盐确定的。SBI 的范围在 1-40 之间。SKCl40 与 10 cm (r2 = 0.71) 深度以下的 SBI 相关,但与 S 吸附最小的 0-10 cm 土壤层无关。其中 S 和 c 是使用 50 mg S kg-1 添加的硫酸盐确定的。SBI 的范围在 1-40 之间。SKCl40 与 10 cm (r2 = 0.71) 深度以下的 SBI 相关,但与 S 吸附最小的 0-10 cm 土壤层无关。其中 S 和 c 是使用 50 mg S kg-1 添加的硫酸盐确定的。SBI 的范围在 1-40 之间。SKCl40 与 10 cm (r2 = 0.71) 深度以下的 SBI 相关,但与 S 吸附最小的 0-10 cm 土壤层无关。
更新日期:2020-01-01
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