Revisiting the permanganate oxidizable carbon (POXC) assay assumptions: POXC is lignin sensitive

IF 2.3 4区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Finnleigh S. Woodings, Andrew J. Margenot
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Abstract

Permanganate oxidizable carbon (POXC) is a popular soil health test developed to measure “labile” C via the reduction of permanganate, dependent on several stoichiometric reduction oxidation assumptions. As a proof-of-concept experiment to evaluate the interpretation of POXC as “labile” C, we tested 17 compounds ranging in biological lability under standard POXC assay conditions at a fixed C mass (25 mg) in a quartz (2–0.053 mm diameter) matrix. POXC was high for lignin, whereas carbohydrates did not differ from the quartz control. Functional group-based reactivity partly explained permanganate reduction. These findings indicate that (i) POXC is not a labile C fraction and (ii) corroborate previous concerns that the stoichiometric oxidation–reduction assumptions in the calculation of C oxidation from permanganate reduced are not sound. POXC interpretation should regard POXC as a chemically defined fraction, report in units of moles permanganate reduced per kg soil, and avoid terms such as “labile” and “active.”

Abstract Image

重访高锰酸盐可氧化碳(POXC)测定假设:POXC对木质素敏感
高锰酸盐可氧化碳(POXC)是一种流行的土壤健康测试,旨在通过还原高锰酸盐来测量“不稳定”C,这取决于几个化学计量还原-氧化假设。作为评估POXC作为“不稳定”C的解释的概念验证实验,我们在石英(直径2–0.053 mm)基质中的固定C质量(25 mg)下,在标准POXC测定条件下测试了17种生物不稳定的化合物。木质素的POXC较高,而碳水化合物与石英对照没有差异。基于官能团的反应性部分解释了高锰酸盐的减少。这些发现表明,(i)POXC不是一个不稳定的C分数,(ii)证实了之前的担忧,即在计算高锰酸盐还原的C氧化时,化学计量氧化-还原假设是不合理的。POXC解释应将POXC视为一种化学定义的分数,以每公斤土壤减少的高锰酸盐摩尔数为单位进行报告,并避免使用“不稳定”和“活性”等术语
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来源期刊
CiteScore
3.70
自引率
3.80%
发文量
28
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