| 摘要 |
The present invention has an object to provide a separation membrane element which has a low content of extractable components and has high boron-removing performance and high water permeability, and relates to a separation membrane element including a composite semipermeable membrane which includes a microporous support and a polyamide separation function layer disposed thereon, the microporous support including a substrate and a porous supporting layer, in which the polyamide separation function layer has a yellowness of 10 to 40, and a concentration of substances extracted from the substrate is 1.0×10 -3 % by weight or less. |
