The silver nitrate binds with the iodide and bromide ... Rinse the glass plate with water to remove the developer. You can now take the plate out of the darkroom. Step 6: Fix the Plate The ...

That will require the Iowa Department of Natural Resources to evaluate their sources of nitrate contamination — which threatens public drinking water — and develop plans to reduce it.

people often get all their water supplies from shallow wells which may be at risk for high levels of nitrate. Variations in groundwater flow patterns, proximity to loading sources such as wastewater ...