EXTENSION phosphates Algae Growth Section You are a technician atthe local water

Question

EXTENSION phosphates Algae Growth Section You are a technician atthe local water analysis company Aquate, and group is asked to develop a method for analysis of phosphate in water samples. When phosphates enter the from the runoff of fertilizers or from other sources such as detergents in wastewater, the p level may increase enough to cause significant algae growth. In the bays of Delaware fertilizer runoff and septic overflow are thought to be responsible for several algae in recent years that have resulted in turbid oxygen depleted water, fish kills, and large accumulations of rotting foul smelling algae. You need to develop a reliable way to measure of phosphates in water samples; if we know where high concentrations of phosphate are, we can start addressing significant points of release. You will adapt your skills of determining solution concentration from lab to address the phosphate concentration measurement. 1. Look up the SDS for sodium phosphate tribasic. Does the Ecological Information support the claim that soluble phosphate harm fish? Does it disprove the claim? 2. In lab, you used the sodium carbonate precipitation of calcium carbonate to measure the concentration of form in To the amount of phosphate in the water, we will a different Choose phosphate to cause a precipitate a compound that you can add to a solution of will this compound work? Hint: Appendix

Explanation / Answer

Q1.

Yes, since sodium phosphate tribasic will change pH drstically, i.e. it will increase due to basicity, then solubility of plnety of gases, specially of O2 in solution will lower.

This means, there is less oxygen for fish, so this is a direct harm.

Q2

CaCO3(s)

precipitates of Phosphate:

Calcium Phosphate, Ca3(PO4)2(s)

Aluminium phosphate AlPO4

Magnesium ammonium phosphate MgNH4PO4

are some examples

These compounds work since they will precipitate all PO4-3 in solution

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