How to prepare an aluminum hydroxide suspension quickly
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Dissolve 125 g of potassium aluminum sulfate in 1 L of distilled water, heat to 60 degrees Celsius, then slowly add 55 mL of concentrated ammonia while stirring, and allow the mixture to stand for 1 hour. Application of the standard method for the determination of chlorides in water – Silver nitrate titration method GB11896-89. Issues: 1. The aluminum hydroxide solution separates very slowly, and there is no large-scale centrifuge available. 2. Is there any other method that can be used as a substitute (to eliminate the influence of sample turbidity)?
This post was last edited by qugd on 2017-3-16 at 12:40 to remove turbid substances from water; filtering can be used for that. What you mentioned about using alum for sedimentation is called flocculation in water treatment processes. This sedimentation process should not be too rapid, otherwise it will be difficult to remove the suspended particles completely. Since the method specifies the use of this approach, settlement time and settlement rate were taken into account when establishing the method – so why accelerate it? It has accelerated the indication that it does not meet the standards.