Preliminary indications of repeatability and reproducibility of the ASTM 5744-96 kietic test for drainage pH and sulfate release rate

摘要

The ASTM standard method D 5744-96 was developed to provide a well-defined kinetic test protocol, conducted under controlled reaction conditions, with the intent of generating reproductible results. The US Bureau of Land Management, American Assay Laboratories, and the Minnesota Department of Natural Resonruces cooperated in a intralaboratory and interlaboratory testing of the protocol. Intralaboratory testing was conducted on duplicate samples of gabbro (8) and siltite-argillite (5) rocks for perods of 20 to 125 weeks. The difference between replicate intralaboratory pH readings on drainage from the gabbro for the drip-trickle leach alternative typically did not exceed 0.1 units, although differences as high as 0.4 units were obsered.