Abstract: A method for the rapid analysis of a cation contained in a liquid, which comprises filtering a liquid sample through a cation exchange filter paper having a high rate of ion exchange, which was made from fibers having cation exchange functional groups, thus collecting substantially the entire amount of the cation contained in said liquid sample in the top surface layer of said filter paper, and analyzing the cation-loaded filter paper as such or the eluate obtained by elution of the cation to be analyzed from said cation-loaded filter paper, to determine the cation.

Abstract: A novel phosphorylated cellulose ester membrane containing 0.1 to 10 % of phosphorus and having a selective permeability. This permselective phosphorylated cellulose ester membrane consists essentially of a phosphorylated cellulose ester obtained by reacting a phosphorylating reagent such as phosphorus oxychloride with a lower aliphatic acid ester of cellulose, which has a reactive hydroxyl group, in an organic solvent, and then hydrolyzing the resulting ester. The membrane can be used widely in separating materials by processes such as reverse osmosis, ultrafiltration, dialysis, electrodialysis, and the like.

Abstract: A photosensitive resin composition comprising pullulan, which is a polymer having repetition units of maltotriose and is represented by the formula, ##SPC1##Wherein n is an integer of 20 to 8,000, and/or a derivative thereof, a photopolymerizable monomer, a photosensitizer and a thermal polymerization inhibitor, or comprising the said pullulan, which has been incorporated with a photoactive reaction group to provide photosensitivity, and a photosensitizer, is a novel composition low in viscosity which can be prepared by use of water and can be formed into a photosensitive plate capable of being developed with water to give a clear image. Since the pullulan in said composition has no toxicity, the waste water formed at the time of development of said photosensitive plate can be treated with ease.