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氧弹量热计法测定不同土壤胡敏酸的热值(能态)表明,不同土壤胡敏酸具有不同的能态。土壤胡敏酸总能态高低与土壤有机质、全氮、胡敏酸含量呈显著正相关。DTA和TG法测定不同土壤胡敏酸的热分解特性表明,不同土壤胡敏酸的DTA、DTG曲线都有共同相似的热效应峰和失重峰。同时表明,与之相对应的焓变(△H)、重量损失百分数(W%),最大重量损失率-(dW/dT)m、活化能(E)、比速率常数(K_0)都有一定差异。红外光谱测定表明,不同温度下,不同胡敏酸热解温度上升到324—338℃时,主要是非核部分脂肪族侧链及氢链结合OH的裂解;当热解温度至444—464℃吋,主要是羧基和芳香核裂解;当热解温室达700℃以上吋,芳香核裂解趋于完全。
The determination of calorific value (energy state) of humic acid in different soils by oxygen bomb calorimeter showed that humus acid had different energy states in different soils. Soil total humin acid level and soil organic matter, total nitrogen, humic acid content was significantly positive correlation. The results of DTA and TG methods for the determination of humic acid in different soils showed that DTA and DTG curves of different soil humic acids all had similar thermal effect peaks and weightlessness peaks. At the same time, the enthalpy change (△ H), weight loss percentage (W%), maximum weight loss rate - (dW / dT) m, activation energy (E) and specific rate constant (K_0) difference. The results of FTIR showed that the pyrolysis temperature of different humic acids increased to 324-338 ℃ under different temperatures, mainly the non-nuclear partial aliphatic side chains and the hydrogen-bonded OH groups. When pyrolysis temperature was 444-464 ℃ , Mainly carboxyl and aromatic nuclear cracking; when the pyrolysis of the greenhouse up to 700 ℃ inches, the aromatic nucleus cracking tends to be complete.