Abstract: For the sake of secure operation, it is of great importance for the power plant to detect chlorine content in the phosphate ester fire-resistant fluids in an accurate and efficient way. In this paper, in order to establish the industry standard called “Detection of Chlorine Content in the Phosphate Ester Fire-Resistant Fluids using Energy Dispersive X-ray Fluorescence Spectrometry Method”, the basic principles, operating conditions and testing methodology are studied. Furthermore, to evaluate the accuracy of the method, five samples are tested collaboratively in seven laboratories. The results show that the water and oil contents have no effects on the results while the helium atmosphere is beneficial for the measurement of chlorine content in the phosphate ester fire-resistant fluids. In terms of repeatability and reproducibility, detection limit, recovery rate and accuracy, the energy dispersive X-ray fluorescence spectrometry testing method for chlorine content in the phosphate ester fire-resistant fluids exhibits high precision and efficiency, and thus can be put into practice in the field of power industry.

Key words: energy dispersive X-ray fluorescence spectrometry, phosphate ester fire-resistant fluid, chlorine, testing method, evaluation of method