RAPID: Role of Physical, Chemical and Diffusion Properties of 4-Methyl-cyclohexane methanol in Remediating Contaminated Water and Water Pipes

这个项目将在这些关键领域产生基础和应用研究1。4-甲基环己烷甲醇(MCHM)的化学物理性质尚未全部评估，它们对于确定饮用水处理、分配系统(例如，消费者家庭)和天然水中的去向和运输是必要的。这项研究的第一阶段将是量化MCHM的化学性质。具体地说：辛醇-水分配系数(Kow)将使用C18高效液相色谱保留时间产生；水的溶解度(S)将通过用MCHM饱和水并测量水的浓度来测量；亨利定律常数(H)将使用静态顶空平衡和固相微萃取-GC/MS来测量。研究人员之前的工作已经开发出一个预测各种有机物在塑料管中的扩散系数和溶解度的模型。使用Kow和S的值，可以估计扩散和管道溶解度。这将有助于验证其他研究的实验室结果，这些研究也调查了MCHM泄漏事件。中草药的含水气味阈值较低，约为0.00001毫克/升，因此消费者可能成为接触低水平中草药的重要监测点。房子里检测异味的主要位置是淋浴，因为水温高，水在密闭区域流动。利用研究人员以前的建模工作和上面第一阶段测得的亨利定律常量，将建立典型阵雨条件下MCHM空气浓度的动态模型。这将确认消费者感官检测是否有助于检测残留MCHM的位置。它还将有助于公用事业公司了解消费者的投诉，从长远来看，将有助于通过吸入进行暴露评估。虽然聚乙烯管道材料已被证明与有机化学品相互作用，但对有机物与用于铺设水管和储水箱内衬的环氧树脂材料的相互作用知之甚少。将使用饮用水级环氧衬里来评估MCHM的吸附/吸收性能。扩散系数和在环氧树脂中的溶解度将使用增重/浸泡、时间滞后和扩散/渗透方法来确定。类似的实验也将在聚乙烯管道材料上进行。2014年1月10日，西弗吉尼亚州9个县的居民被州长告知“不要喝水”，因为水被用于清洁煤炭的臭气熏天的4-甲基环己烷甲醇(MCHM)污染。尽管2014年1月13日开始取消用水限制，预计所有居民最终都能喝上自来水，但这种化学物质在水系统中的短期和长期去向和运输仍然存在许多科学知识空白。这笔快速赠款将填补其中的许多空白。这项研究试图提供基本的科学数据，以避免西弗吉尼亚州的MCHM泄漏和随后的饮用水处理和分配系统污染造成的潜在健康和环境问题。所获得的知识将通过期刊出版物和在专业会议上的陈述与科学界和工程界分享。有关管道材料污染和净化的知识将通过一份面向公民的简短出版物与公众分享，该出版物将张贴在水资源研究中心的网页上。学生研究人员将通过我们“水界面跨学科研究”网站上的博客传播所学到的知识。

Dietrich1424234This project will generate fundamental and applied research in these key areas.1. The chemical-physical properties of 4-methyl-cyclohexane methanol (MCHM) have not all been evaluated and they are necessary to determine the fate and transport within the drinking water treatment, distribution system (for example, consumers homes), and natural waters. The first stage of this research will be to quantify the chemical properties of MCHM. Specifically: the octanol-water partition coefficient (Kow) will be generated using C18 HPLC retention time; the aqueous solubility (S) will be measured by saturating water with MCHM and measuring the aqueous concentration; and the Henry's Law constant (H) will be measured using static headspace equilibrium and SPME-GC/MS.2. Previous work by the researchers has developed a predictive model of diffusion coefficients and solubility for a wide range of organics in plastic pipe. Using Kow and S values, diffusion and pipe solubility's will be estimated. This will help validate laboratory results from other research also investigating the MCHM spill.3. MCHM has a low aqueous odor threshold of approximately 0.00001 mg/L. Thus consumers can potentially become important monitoring sentinels for exposure to low levels of MCHM. The main location in the house to detect off-odors is the shower because of high water temperatures and water flows in a confined area. Using previous modeling work by the researchers and the measured Henry's Law constants from stage 1 above, dynamic models of MCHM air concentrations for typical showering conditions will be developed. This will confirm if consumer sensory detection can aid in detecting locations of residual MCHM. It will also aid in the utility's understanding of consumer complaints, and in the longer term will aid in exposure assessment through inhalation.4. While polyethylene pipe materials have been shown to interact with organic chemicals, less is known about the interaction of organics with epoxy materials used to line water pipes and storage tanks. Drinking-water-grade epoxy-liner will be used to evaluate sorption/uptake performance for MCHM. Diffusion coefficients and solubility in epoxy will be determined using weight gain/immersion, time lag, and diffusion/ permeation methods. Similar experiments will be conducted on polyethylene pipe materials.On January 10, 2014, residents of nine West Virginia counties were told by their governor "Do Not Drink the Water" because it was contaminated with odorous 4-methyl-cyclohexane methanol (MCHM) which is used to clean coal. Even though the water restrictions began to be lifted on January 13, 2014 and all residents are eventually expected to be able to drink tap water, there are still many scientific knowledge gaps in the short and long term fate and transport of this chemical in water systems. This RAPID Grant will address many of those gaps. This research seeks to provide fundamental scientific data that can be used to avoid potential health and environmental problems caused by the MCHM spill in West Virginia and the subsequent contamination of the drinking water treatment and distribution system. The knowledge gained will be shared with the scientific and engineering communities through journal publications and presentations at professional conferences. The knowledge on pipe material contamination and decontamination will be shared with the general public through a short, citizen-oriented publication to be posted on the Water Resources Research Center web page. Student researchers will disseminate the knowledge gain through blogs on our "Water INTERFACE Interdisciplinary Research" website.