The objectives of this study are to compare the chemical properties of organic matter (OM) in alkaline extracts of turkey litter compost, source‐separated organic compost, and biosolid pellets, and to validate the use of humic acids (HAs) for analyzing the functionality (i.e., the ability to complex with nutrients) of OM. The humic fractions, including (HAs), fulvic acids (FAs), and alkaline nondissolved fraction (humin), were isolated either with NaOH or Na₄P₂O₇ (PyroP) and the chemical properties were analyzed by solid‐state ¹³C NMR spectroscopy. The study showed that the proportions of each functional group of the combination of HAs, FAs, and humin were essentially identical to that of their HCl‐treated original materials, except for a lower recovery of O‐alkyl groups. Although the yield of HAs extracted with PyroP was lower than that with NaOH, their spectral characteristics were not significantly different. The functionality of the OM, assuming a correlation with the sum of the proportions of carboxyl and phenolic groups, was higher in both HAs and FAs than that in humin. Based on the proportion and functionality of the HAs in the OM, we conclude that the use of HAs extracted with either NaOH or PyroP is valid for studies of OM functionality. The study also shows that the functionality and stability of OM are highly source dependent. We predict that amendments of the more humified turkey litter compost would have higher potential to increase SOM levels and retain nutrients compared with the source‐separated organic compost and biosolid pellets.

中文翻译：

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NaOH和Na4P2O7萃取方法表征有机修饰剂的验证和比较

这项研究的目的是比较火鸡垃圾堆肥，分离源有机堆肥和生物固体颗粒的碱性提取物中有机物（OM）的化学性质，并验证腐殖酸（HAs）用于分析功能的有效性（即。，复合的能力与营养素）OM的。用NaOH或Na ₄ P ₂ O ₇（PyroP）分离腐殖质级分，包括（HAs），黄腐酸（FAs）和碱性非溶解级分（humin），并通过固态¹³分析化学性质13 C NMR光谱。研究表明，HA，FA和腐殖质结合物中每个官能团的比例与经过HCl处理的原始材料的比例基本相同，只是O-烷基的回收率较低。尽管用PyroP提取的HAs的产率低于用NaOH提取的HAs，但它们的光谱特性没有显着差异。假设与羧基和酚基团的比例之和相关，OM的功能在HAs和FAs中均高于在humin中。基于OM中HA的比例和功能，我们得出结论，使用用NaOH或PyroP提取的HA对OM功能的研究是有效的。该研究还表明，OM的功能和稳定性在很大程度上取决于源。