羰基硫(COS)在五种富氧型土壤中的吸收与转化

UPTAKE AND CONVERSION OF CARBONYL SULFIDE IN FIVE OXIC SOILS

针对大气中羰基硫(COS)源和汇的不平衡问题,利用气相色谱(GC)和离子色谱(IC)对COS在5种富氧型土壤(北京麦田土壤、山东麦田土壤、人工草坪土壤、天然草坪土壤和森林土壤)中的吸收与转化进行了研究,结果显示,所研究的富氧型土壤均表现为COS的汇,为理解COS源和汇的不平衡问题提供了新的数据.土壤吸收COS的快慢与土壤的类型有关.采用IC对土壤吸收COS的转化产物进行了定量研究,结果表明,北京麦田土壤吸收的COS转化为水溶性硫酸盐的比率较低约为40%,其它4种富氧型土壤均能将所吸收的COS约50%转化为水溶性硫酸盐.

Considering the known sources of COS are not balanced with its sinks,the uptake and converison of COS in five oxic soils（the Beijing wheat soil,the Shandong wheat soil,the Beijing artificial lawn soil,the Qinghai natural grass soil,and the Beijing forest soil） at room temperature were investigated using GC and IC methods.This result indicates that the investigated oxic soils act as sinks for COS,which may help to understand the imbalance of COS.The rate of COS uptake in the oxic soils varied with the type of oxic soils.The IC experimental results exhibited the ultimate fate of COS in the investigated oxic soils： about 50% of the consumed COS by the oxic soils was eventually converted into water-soluble sulfate except for the wheat soi in Beijing which had a conversion rate of about 40%.