The basicity of polyaluminum chloride (PAC) can be determined by measuring its chloride ion content. Commonly used measurement methods include the following:
Silver-chloride titration method: react the PAC sample with the silver salt standard solution, so that the chloride ions in the PAC react with the silver ions to form a precipitate, and calculate the basicity of the PAC by the weight of the precipitate or the dissolved silver ion content.
Colorimetric method: react the PAC sample with iron ammonium salt to form a light yellow complex, measure the absorbance of the complex with a Colorimeter, calculate the chloride ion content in PAC according to the standard curve, and then calculate the salt of PAC basis.
Potentiometric titration method: After dissolving the PAC sample, measure the chloride ion concentration with a chloride ion selective electrode to calculate the basicity of PAC.
NBCHAO reminds you: Different determination methods may carry out different pretreatments on PAC samples, such as adjusting pH value, adding indicators, etc. When conducting experiments, the appropriate measurement method should be selected according to the actual situation.