1989 Volume 30 Issue 1 Pages 29-34
Since a small amount of urine-soil added to sodium hypochlorite solution consumes a proportional amount of available chlorine, the amount of urine-soil remaining in washed cloths was determined by measuring the consumption in the solution in which they were dipped.
Cloths soiled with 3-4 month-old sucklings' urine (S), more-than-6 month-old babies' urine (B), adults' urine (A), and urea solution (U) were washed by water in a tub located in a water-bath incubator at 120 shakes/min. 30°C.
RESULTS: 1. (S) and (U) can be easily removed by 3-minute washing repeated twice. 2. After three repetitions of 3-minute washing, as well as after LAS solution washing followed by rinsing by water twice, soil of (A) still remains. (B) also shows similar tendency. 3. After five-minute shaking or three cycles of washing, little further removal was noticed. 4. The shorter the lapse after soiling until washing, the smaller is the soil remained. But, after five hours to twenty-four hours' lapse, the amount of remainder does not change.
