Bubble interference in Turbidity measurement

Have a restrictor after the meter to raise pressure in the meter. Make sure pressure is not dropping before or inside the meter. Pressure should eliminate bubbles, and not affect turbidity readings.

You may be able to eliminate the bubbles by placing the liquid under a vacuum before putting in the instrument. This may cause the bubbles to grow to a large enough size to come to the surface and pop.

You may also try putting the liquid in an ultrasonic cleaner to remove bubbles.

Increase the surface energy of the inside of the analyzer (may be made of plastic) by surface treatment. Then the liquid will "wet out" and no more bubbles!

The bubbles in the water sample could be due to the presence of agitation or surfactants present in water.

Any effort to destabilize bubbles will disturb the estimation of suspended solids.

You may try the following.

*Add few drops of Defoamer[silicon or fatty oil based or solvent based- bare minimum to avoid suspended impurities getting along. wait for some time to see the foam/ bubbles destabilize. (OR)

*Add few drops of Hydrogen peroxide so that all bubbles move to top layer.(or]

*Acidic pH can also help tp some extent.(OR}

*Another simplest idea is to cool the water sample in fridge so that so that all bubbles collapse out due to shrinkage.{or]

*Similarly heating can also de aerate the bubbles.

I Think you may proceed on these principle and minimize the bubble error.Remember all conditions to apply only turbidity analysis and the water sample need not be used for other tests because of it"s added contents or changed physical/ chemical conditions.