A dispersing agent of sodium hexametaphosphate is used at what rate per liter of solution?

The use of sodium hexametaphosphate as a dispersing agent is primarily aimed at deflocculating soil samples, ensuring that the particles in the sample remain suspended in the liquid, which is crucial for accurate particle size analysis. In this context, the recommended rate for using sodium hexametaphosphate is typically 40 grams per liter of solution. This concentration has been established based on practical applications and laboratory standards that ensure optimal performance in dispersing soils and aggregates.

Using 40 grams per liter strikes the right balance for effectively dispersing the particles without causing excessive dilution, thus maintaining the integrity of the sample for testing. This concentration is known to aid significantly in the separation of soil and aggregate particles for analysis, enhancing the accuracy of results in laboratory procedures.