Abstract: There is provided an infusion solution for peripheral intravenous administration comprising a multichamber vessel constructed in a connectable manner, which separately houses a sugar solution containing sugars, electrolytes and vitamin B1, and an amino acid solution containing amino acids, electrolytes and a sulfite, whereby the vitamin B1 and amino acids are stably maintained. In the infusion solution for peripheral intravenous administration, the sugar solution contains calcium gluconate, contains no greater than 1.4 g/L sodium lactate, has a pH of 4.0-4.7 and has a titratable acidity of 2-4, the amino acid solution contains 4.0-8.0 g/L sodium lactate, contains no calcium gluconate, has a pH of 6.8-7.2, contains free L-cysteine as cysteine and contains 0.05-0.2 g/L sodium hydrogen sulfite, and after the sugar solution and amino acid solution have been mixed, the infusion solution has a pH of 6.5-7.1 and a titratable acidity of 5-10.

Abstract: A reservoir assembly can stably hold a bicarbonate solution. The reservoir assembly includes a gas-permeable plastic container holding a bicarbonate solution and a gas-impermeable casing for encasing the container. An effective way of detecting pinholes in the casing of the reservoir assembly is also provided. An oxygen absorber and an oxygen-detecting agent are placed in the space between the container and the casing. The oxygen absorber is of the type that does not affect the pH or the bicarbonate ion concentration of the solution and mainly contains a crosslinked polymer having carbon-carbon unsaturated bonds.