I stumbled upon these two research articles on another forum:
Fe : http://www.env.gov.bc.ca/wat/wq/BCgu...n_overview.pdf
PO4: http://ceqg-rcqe.ccme.ca/download/en/205To protect freshwater aquatic life guideline for iron is 1 mg/L for total iron and 0.35
mg/L for dissolved iron
Isn't this much lower most of us use?These phosphorus limits allow management to
define where their water bodies lie, and define a trigger
range for that water body.
Table 1. Total phosphorus trigger ranges for Canadian
lakes and rivers.
Canadian Trigger Ranges
Trophic Status Total phosphorus (μg·L-1)
Ultra-oligotrophic < 4
Hyper-eutrophic > 100