[DuckConference]

All the heavy metals were below 1ppm, are any of the levels concerning?

[orbital-decay]

In case there's some natural accumulation process, the concentration can reach any levels, so absolute quantity might (or might not) matter as well.

[jeffybefffy519]

I found it a bit concerning that this doesnt talk about safe dosages of any of the heavy metals.

[ted_dunning]

Many of the levels are well above the levels required for drinking water.

That isn't much to go on, however.

[fuzzfactor]

Also, real ppm for this kind of thing is supposed to be by weight, so that would ideally be pounds per million-pounds.

IOW if they dumped a million pounds all over the place, and there was 1 ppm of trace lead content, then there was one full pound of unwanted lead scattered across the same acreage as the 900,000+ pounds of active ingredient.

However, ppm for environmental laboratories conventionally means milligrams per liter since that's a close equivalent to weight ppm, but realistically only for water samples. So for test material having a density different than water, some correction is needed which can often be neglected, but the real number is usually within the same order of magnitude.