Abstract
Conventional equations to estimate sampling variability are insufficient because they are based on the assumption that wastes consist of a single composition. In this paper, we applied sampling equations for multicomposition wastes obtained theoretically in the previous paper to four wastes, and estimated required sampling weights. Our result showed that 25 kg of sampling weight and 110 g of subsampling weight are required for the Japanese standard leaching test No. 13 for wastes containing many compositions. However, the coefficient of variation of the test results under the sampling conditions was estimated to be 1.1. It was concluded, therefore, that wide variations under practical sampling conditions must be accepted. We also then examined a statistical determination method of test results that take variability into consideration. The examination showed that test results would exceed the standard values with more than 10% probability if the average test value is not less than 0.6 times the standard value.
