纳滤（NF）中正负官能团（FGs）的浓度和 反渗透膜（RO）已被成功地量化为pH值的函数 使用卢瑟福背散射光谱法（RBS）进行离子探测。FGs的浓度 在pH范围内，NF（TFC-S®）膜的浓度高于RO（FT30®）膜 研究范围为3.5-10.3。从FGs浓度获得的等电点 TFC-S®（NF）膜的测量结果发现pH值为5.5，与数值一致 文献中报道了聚酰胺NF膜。包括5个参考文献、图表。

The concentration of positive and negative functional groups (FGs) in nanofiltration (NF) and reverse osmosis membranes (RO) have been successfully quantified as a function of pH by ion probing using Rutherford Backscattering Spectrometry (RBS). The concentration of FGs was higher for the NF (TFC-S®) than for the RO (FT30®) membrane tested within the pH range of 3.5-10.3 studied. The isoelectric point obtained from FGs concentration measurements of TFC-S®(NF) membrane was found to be pH~5.5, consistent with values reported in the literature for polyamide NF membranes. Includes 5 references, figures.