For more on nitrates/nitrites, click:
http://www.ec.gc.ca/ceqg-rcqe/English/Html/GAAG_Nitrate_WQG.cfm
For phosphates/phosphorus:
http://www.ec.gc.ca/ceqg-rcqe/English/Html/GAAG_Phosphorus_WQG.cfm
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A collection of resources for teachers and students of earth science or environmental science at the middle and secondary levels.
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