Is the total suspended solids (TSS) or Turbidity sensor can be used in measuring the ammonia nitrogen concentrations of the fish`s water rather the ammonia sensor as it is too expensive and not available in the Egyptian market
I very much doubt that.
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Absolutely not. I have experience in environmental chemistry. Total suspended solids refers to any non-soluble finely reticulated material which can be suspended in water. Ammonia and nitrogen in water are present as dissolved ions not suspended solids which can be measured by turbidity.
(for which turbidity can be used in some systems to monitor changes in real time, but not to measure TSS quantitatively).
To measure ammonia you will require an ammonium ion selective electrode. To measure nitrogen you will have to have a nitrate ion selective electrode.
Both can be interfaced to micro-controllers. However not directly. Carefully designed amplifier circuits will be required, and the ISE probes are expensive, delicate and have typically fairly short lifetimes when used in continuous monitoring systems.
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That is as maybe, but there are other factors that can cause turbidity. How do you propose to eliminate those and so know what you are measuring?
The OP did not ask how to measure TSS or Turbidity for that matter. My post was intended to address whether he could use a turbidity sensor to measure Ammonia and Nitrogen, which he can't. Admittedly I used perhaps careless wording to keep things simple.
In environmental systems there are so many interferences and complexities that the typical approach of find a sensor, google a schematic, which is often not even assembled correctly much less understood, then copy and paste some code is in general nearly pointless, but even that appears to be more than many posters seem capable of.
System context is, however, the starting point. There are many factors that can cause turbidity yes. Turbidity does not measure actual TSS. That has to be done by micron filtering samples and gravimetrically measuring them. Usually ina program that also measures TVS, TDS and TS as well as TSS.
Turbidity is also not generally useful in a system that for example involve high flow rates that may entrain gas (often air, but not always) or that can generate entrained gas by cavitation.
Turbidity can also be caused by among other things, systems that contain immiscible liquids emulsified in water. These typically also consist of high enough levels of stabilizing surfactants to be toxic or lethal to fish life. Also immiscible liquids in water at the levels that would cause turbidity tend to be toxic themselves because they coat and interfere with gill breathing mechanisms.
In the OP context of a living fish environment, Turbitdity can be useful. It corresponds reasonably well with actual TSS which in this specific conceptual case will be primarily silt influx or algae bloom.
Turbidity in this context is helpful in that Turbidity and TSS are complimentary. TSS and the associated panel require lengthy sampling times and protocols. Turbidity on the other hand allows setting control limits for potential, realistic common concerns arising from common concerns from silt induction or algae bloom in a continuous monitoring context,
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