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LIBS and FTIR–ATR spectroscopy studies of mineral–organic associations in saline soil
Land Degradation & Development ( IF 4.7 ) Pub Date : 2020-11-13 , DOI: 10.1002/ldr.3829
Fei Ma 1 , Changwen Du 1, 2 , Yiqiang Zhang 3 , Xuebin Xu 1, 2 , Jianmin Zhou 1
Affiliation  

Direct characterization of the spatial distribution of elements and compound binding of salt–organic associations in soil is imperative for understanding the mechanisms of organic matter decomposition and nutrient release involved in soil degradation and development processes. However, traditional chemical methods would damage the chemical bonds in salt–organic associations, and modern spectroscopic techniques provide alternative options for resolving this problem. In this study, mid‐infrared‐attenuated total reflectance spectroscopy (FTIR–ATR) was used to obtain molecular group information; laser‐induced breakdown spectroscopy (LIBS) was applied to obtain microlevel distribution of elements, and two‐dimensional correlation spectroscopy (2DCOS) analysis was conducted to illustrate the binding combination features of mineral–organic associations in saline soil from the Hetao Irrigation District in China. The results showed that the distributions of Mg, Ca, Na, and K were heterogeneous at the microlevel; the spatial distributions of Mg and Ca showed a significant correlation (r = 0.90***), while K displayed a negative correlation with the soil organic matter (SOM) contents. In the soil with lower SOM contents, the elements were distributed at the top of the ablation area and enhanced with the increasing SOM content, which reflected the trends of the SOM layer thickness outside the mineral–organic associations at the microlevel. Furthermore, 2DCOS analysis suggested that the hydrogen bonds in silicate groups were stronger than those of organic functional groups, such as C=O/C=C, when combined with salt‐related compounds, and Mg, Ca, Na, and K did not originate from clay mineral compounds in saline soil but partially originated from deposited organic associations.

中文翻译:

LIBS和FTIR-ATR光谱研究盐渍土壤中的矿物-有机缔合

必须直接表征土壤中元素的空间分布和盐有机化合物的结合,才能理解土壤退化和发育过程中有机物分解和养分释放的机理。但是,传统的化学方法会破坏盐有机化合物中的化学键,而现代光谱技术为解决该问题提供了替代选择。在这项研究中,中红外衰减全反射光谱(FTIR–ATR)用于获得分子组信息。激光诱导击穿光谱法(LIBS)用于获得元素的微观分布,进行了二维相关光谱分析(二维相关光谱分析),以说明河套灌区盐渍土中矿物-有机缔合的结合组合特征。结果表明,Mg,Ca,Na和K的分布在微观上是不均匀的。镁和钙的空间分布呈显着相关(r = 0.90 ***),而K与土壤有机质(SOM)含量呈负相关。在SOM含量较低的土壤中,元素分布在消融区域的顶部,并随着SOM含量的增加而增强,这反映了微观层面矿物-有机缔合之外SOM层厚度的变化趋势。此外,2DCOS分析表明,当与盐相关的化合物结合使用时,硅酸盐基团中的氢键比有机官能团(例如C = O / C = C)中的氢键更强,而Mg,Ca,Na和K则不源自盐渍土壤中的粘土矿物化合物,但部分源自沉积的有机缔合。
更新日期:2020-11-13
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