title: Desorption of bis(2-chloroethyl) sulfide, mustard agent, from the surface of hardened cement paste (HCP) wafers.
abstract: The decontamination of surfaces exposed to chemical warfare agents is an interesting scientific topic. The desorption behavior of bis(2-chloroethyl) sulfide (sulfur mustard, HD) from the surface of the HD-contaminated hardened cement paste (HCP) was investigated under different weather conditions, which should provide scientific reference data for protection and decontamination projects involving HD-contaminated HCP in different conditions. The desorption of HD from the surface of HCP wafers was studied, and the effects of the purge air flow rate, water content, sorption temperature, and substrate age were investigated. HD desorption was detected from the surface of HD-contaminated HCP, but the desorption velocity was relatively slow. The desorption quantity remained within an order of magnitude throughout a time span of 36h (25°C at 200mL/min of purge air), and the amount of HD that was desorbed from each square meter of HCP surface was approximately 1.1g (25°C at 200mL/min of purge air), which was approximately 5.5 percent of the total HD that was initially applied. A higher flow rate of the purge air, increased water content, and longer substrate age of HCP all increased the HD desorption. In contrast, increased temperatures suppressed HD desorption.
authors: The Institute of Chemical Defence, P.O. Box 1048, Beijing 102205, China. hrtang@sina.com
authors: Hairong
authors: H
authors: Tang
authors: Xuezhi
authors: X
authors: Zhou
authors: Yingqiang
authors: Y
authors: Guan
authors: Liming
authors: L
authors: Zhou
authors: Xinming
authors: X
authors: Wang
authors: Huijuan
authors: H
authors: Yan
mesh_terms: D000388:Air; D002619:Chemical Warfare Agents / Q000032:analysis / Q000737:chemistry*; D003252:Construction Materials / Q000032:analysis*; D003666:Decontamination; D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry*; D009151:Mustard Gas / Q000032:analysis / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D002619:Chemical Warfare Agents; D004785:Environmental Pollutants; D014867:Water; D009151:Mustard Gas