In Japan, chloroethylene is a regulated substance under the soil contamination countermeasures act since 2017, due to the presence of chloroethylene in soil leachate and groundwater. As a consequence, chloroethylene concentrations must be accurately determined to ensure the safety of drinking water, yet chloroethylene standard solutions with reliable concentrations have not been available because chloroethylene is difficult to handle due to its boiling point of − 13 °C. Here, we developed a quantitative ¹H nuclear magnetic resonance (¹H-qNMR) method to measure chloroethylene concentration in a standard solution in CD₃OD. Sampling temperature must be between − 80 °C and − 21 °C, and the NMR tube headspace volume ratio must be lower than 23% to reduce the volatilization of chloroethylene. We used the signal of CD₂HOD present in the standard solution as an internal standard because chloroethylene was volatilized during the addition of another internal standard. The chloroethylene concentration in the standard solution was accurately determined as 117.7 ± 1.4 mg kg⁻¹.

在日本，由于土壤渗滤液和地下水中存在氯乙烯，自2017年以来，根据土壤污染对策法案，氯乙烯是受管制物质。因此，必须准确确定氯乙烯的浓度以确保饮用水的安全性，但是尚无具有可靠浓度的氯乙烯标准溶液，因为氯乙烯的沸点为− 13°C，因此难以处理。在这里，我们开发了一种定量¹ H核磁共振（¹ H-qNMR）方法，用于测量CD ₃标准溶液中的氯乙烯浓度。OD。采样温度必须在− 80°C至− 21°C之间，并且NMR管的顶空体积比必须低于23％，以减少氯乙烯的挥发。我们使用标准溶液中存在的CD ₂ HOD信号作为内标，因为在添加其他内标的过程中氯乙烯会挥发。准确测定标准溶液中的氯乙烯浓度为117.7±1.4 mg kg ^-1。