Great, great info here. Thanks AK and Ricky.
Before you posted to this thread, Ricky, I had never heard of .70 Truncheon or .50 Hanna. All I new was that the articles that I came across used different weights to derive their PPM and made no mention as to which method they used. I had to do the three different calculations myself to determine which method the articles' authors were using and then, that way, I could do an "oranges to oranges" comparison.
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