有机物对化学消毒效果的影响

试验测定血清等有机物对化学消毒剂的消耗率,发现血清对消毒剂有效成分消耗严重,碱性条件更使消耗量有所增加。磷酸钠可增强卤素消毒剂在有机物干扰下的杀菌作用。增加消毒剂用量,在有机物存在下亦可提高消毒效果。测定消毒剂有效成分余留浓度有可能作为判断消毒效果的间接指标。

INFLUENCE OF ORGANIC MATTER ON EFFICACY OF CHEMICAL DISINFECTION

The influence of organic matter on germicidal action of chemical disinfectants was examined in laboratory. The results indicated that 10 organic substances including serum, stool, urine, saliva, hepatic tissue, starch, vegetable oil, lard, milk and soap water could reduce significantly the available chlorine of chlorinated sodium phosphate or peracetic acid of peracetic acid solution, especially the influence exerted by hepatic tissue and serum. When 7 disinfectants including iodophor, sodium hypochlorite , chlorinated sodium phosphate, sodium dichloroisocyanurate, chlorobromoisocyanuric acid, peracetic acid and formaldehyde were tested for the influence of 10% serum, the active principle of chlorobromoisocyanuric acid (BrCl) decreased markedly. When disinfectant was used in presence of serum, sodium carbonate could enhance the decrease in active principle, while sodium phosphate exhibited synergistic germicidal effect with halogen disinfectant on Escherichia coli or HBsAg in presence of serum. With the concentration of disinfectant unchanged, increase in dosage could promote disinfection of the suspension of E. coli or HBsAg to fulfil the requirement and increase the residual active principle of the disinfectant.