Phosphates in water:
In October this year, thonce again did not pass a bill restricting the use of phosphates in household chemicals. Why is this restriction necessary and is phosphate household chemicals really dangerous? And what type of water filtration plant or water filter for home or water softener plant is required?
What are these substances?
Phosphates are salts of phosphoric acid, in simple terms, they are compounds of phosphoric acid with certain, often alkaline, metals.
What phosphates are soluble in water?
- Dihydrophosphates dissolve best in water, and worst of all are hydrogen phosphates and phosphates. Polyphosphates also exist – these are substances that consist of phosphorus “chains” and organic phosphorus-containing substances.
- Phosphorus and nitrogen are important nutrients. They are necessary for the full functioning of all living organisms. In water, phosphorus is in the form of inorganic, organic, and organomineral compounds, and is also part of the cells of hydrobionts. It should be noted that inorganic compounds have maximum bioavailability.
- When there is too much phosphorus and nitrogen in water, microorganisms get more nutrients, and accordingly begin to multiply more actively. Such processes are called eutrophication. Due to eutrophication, the oxygen content decreases, fish die, and large volumes of biomass make water treatment more difficult.
Phosphate cycle in nature:
, you can clearly see where phosphorus goes, these are living organisms, deposits, production needs and the very blue-green algae that begin to aggressively multiply when there is an excess of nutrients in the water – nitrogen and phosphorus.
As for the receipt, as we see it, wastewater, fields, weathering of rocks. We will deal with this later in more detail.
Phosphate determination:
They are determined according to DSTU 7525: 2014 Drinking water. Requirements and methods of quality control will also help determine phosphates in water. GOST 18309-2014 Water. Methods for the determination of phosphorus-containing substances (used previously).
MPC for phosphates in water for different water sources (mg / dm3):
- drinking – 3.5;
- water supply – 0.4;
- flowing reservoirs – 0.1;
- ponds and lakes – 0.05;
- return water is 0.03.
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