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定影液是含有硫代硫酸钠、亚硫酸钠等化合物的水溶液。在使用定影液处理照像胶片的过程中,其中硫代硫酸钠与胶片上未感光和未与显影液起变化的囟化银(AgX)作用,生成二硫代硫酸合银络离子,而溶入溶液中。AgX+2S_2O_3~(2-)→[Ag(S_2O_3)_2]~(3-)+X~- (1)过去,曾将使用过的定影液当作废液弃去。但这种废定影液中含有一定量的银,经测定,每升一般在五克以上,可高达七克。全国各地医院放射科的废定影液很多,银是稀贵金属之一,如果能把其
The fixing solution is an aqueous solution containing a compound such as sodium thiosulfate and sodium sulfite. In the process of using a fixing solution to process a photographic film, sodium thiosulfate interacts with silver halide (AgX) which is not sensitized on the film and does not change from the developing solution to form silver dithiosulfate ions, Into the solution. AgX + 2S_2O_3 ~ (2) → [Ag (S_2O_3) _2] ~ (3 -) + X ~ (1) In the past, used fixing solution was discarded as a waste liquid. However, this waste fixing solution contains a certain amount of silver, determined by more than five grams per liter, up to seven grams. There are a lot of waste fixing fluid in the hospital radiology department throughout the country. Silver is one of the rare metals,