Abstract: Sodium silicate,sodium,carbonate and their mixture with different concentrations were selected to be stabilizers for sodium hypochlorite solution with active chlorine content of 0.5% (mass fraction,same below).Their influences on the stability of sodium hypochlorite solution were studied.By analyzing the active chlorine contents of sodium hypochlorite solution,the results showed that：while maintaining standing and constant temperature at 54 ℃ after 14 d,the maximum active chlorine concentrations of sodium hypochlorite solution with sodium silicate,sodium carbonate,and the mixture as stabilizers were 88.16%,86.81%,and 92.85%,respectively,of the initial concentration;however,under the same conditions,the maximum active chlorine concentration of the sodium hypochlorite solution without any stabilizer was only about 76.58% of the initial concentration.Results showed that the mixture of sodium silicate and sodium carbonate could be a good stabilizing agent for sodium hypochlorite solution.

Key words:  , sodium silicate, sodium carbonate, sodium hypochlorite solution, stability