A method to evaluate enhanced rock weathering using intact soil monoliths under field conditions

IF 1.6 Q2 MULTIDISCIPLINARY SCIENCES MethodsX Pub Date : 2024-09-23 DOI:10.1016/j.mex.2024.102971

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Abstract

Enhanced rock weathering (ERW) has attracted considerable attention as a carbon dioxide removal (CDR) strategy. However, a reliable method for accurately measuring, monitoring, and verifying carbon dioxide (CO₂) removal, particularly under field conditions, remains elusive. Here we describe a method for installing soil monoliths in an in situ buried apparatus that allows collection of water draining through a soil, undisturbed by external environmental factors that may affect similar apparatus located above ground. The method provides a robust, cost-effective means of collecting, developing, and establishing soil monoliths, allowing through drainage soil water sample collection and analysis, and so facilitating estimation of ERW CO₂ removal. A 200 mm diameter polyvinyl chloride (PVC) pipe is inserted into the soil to extract intact monoliths from a site of interest, withdrawn and then fitted with a basal double socket coupling and end cap for leachate collection. It is buried to reproduce soil environmental conditions, and water is collected via a sampling tube to surface. Validity was confirmed through an experimental trial with 36 monoliths over 6 months. This method enables accurate chemical analysis of solute draining through the soil monolith, which can be used to validate models of ERW efficacy.

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PVC pipes are inserted into the target soil and subsequently extracted to retrieve intact soil monoliths
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PVC sockets, equipped with a mesh and a geotextile membrane in the middle to retain the collected intact soil monolith and prevent soil particle transport, are then attached to the PVC pipe
•
PVC caps, featuring a small drainage tube attached to its outer side, are used to collect the leachate at the bottom part of the system.

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在野外条件下利用完整土壤单体评估岩石风化强化的方法

强化岩石风化（ERW）作为一种二氧化碳去除（CDR）策略，已经引起了广泛关注。然而，准确测量、监测和验证二氧化碳（CO2）去除情况的可靠方法，尤其是在野外条件下的去除情况的可靠方法，仍然没有找到。在这里，我们介绍了一种在原地埋设装置中安装土壤单体的方法，这种方法可以收集通过土壤排出的水，不受外部环境因素的干扰，而这些因素可能会影响地面上的类似装置。该方法提供了一种稳健、经济高效的收集、开发和建立土壤单体的方法，允许通过排水系统收集和分析土壤水样本，从而有助于估算战争遗留爆炸物的二氧化碳去除率。将直径为 200 毫米的聚氯乙烯（PVC）管插入土壤中，从感兴趣的地点提取完整的单体，然后抽出，再安装一个基底双承插接头和端盖，用于收集沥滤液。将其埋入地下以再现土壤环境条件，并通过采样管将水收集到地表。通过对 36 块单体进行为期 6 个月的实验测试，证实了该方法的有效性。这种方法能够对通过土壤单体排出的溶质进行精确的化学分析，可用于验证战争遗留爆炸物的功效模型。将聚氯乙烯管插入目标土壤，然后抽出，以回收完整的土壤单体--然后将聚氯乙烯插座连接到聚氯乙烯管上，插座中间装有网眼和土工织物膜，以保留收集到的完整土壤单体并防止土壤颗粒迁移--聚氯乙烯管帽用于收集系统底部的沥滤液，管帽外侧装有小型排水管。

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