Provisional tolerable monthly intake

PTMI (Provisional Tolerable Monthly Intake) A provisional estimate of the amount of a hazardous substance with cumulative properties in food or drinking water, expressed on a body-weight basis, that can be ingested monthly over a lifetime without appreciable health risk. 

PSA potentiometric stripping analysis PS-MS plasma source-mass spectrometry PTFE polytetrafluorethylene PTMI Provisional Tolerable Monthly Intake PTWI Provisional Tolerably Weekly Intake (WHO)... 

The elevated toxaphene levels in Lake Superior have social and economic impacts as well. The 2003 Guide to Eating Sport Fish published by the Ontario Ministry of Environment and Energy [158] indicates fish consumption advisories for Lake Superior lake trout due to toxaphene levels. As a result of the high toxaphene levels, the Ontario Ministry of Natural Resources has restricted sale with Ontario (but not the export) of large lake trout harvested from Lake Superior as of 1995. An assessment of toxaphene levels in Lake Superior fish fillets by Health Canada concluded that consumption of lake trout, salmon, longnose sucker and whitefish muscle from northwestern areas of the lake should be limited to one or two meals per month (55-135 g/week) based on a provisional tolerable daily intake of 0.2 pg/g body wt/day [159]. 

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