通过采用离子色谱法测定不同碱性和温度条件下硫离子浓度的变化,对硫化氢溶液的稳定性进行了系统的研究,并对硫化氢溶液的长时间稳定性进行了考察。研究表明:随着温度的升高,硫化氢溶液的稳定性逐渐下降。在15 ℃~25 ℃的温度条件下,pH不小于11时,硫化氢溶液可以稳定存在;pH小于11时,随着pH的降低,硫化氢溶液的稳定性逐渐降低;当氢氧化钠基体浓度为20 mmol·L-1,即便硫化氢溶液中硫离子质量浓度低至1 μg·L-1时,硫化氢溶液仍然能够保持至少30 d的稳定。

Stability of hydrogen sulfide solution was studied by measuring the concentration change of S2- under different alkaline and temperature conditions using ion chromatograghy, in addition, long-term stability was studied too. It was found that stability of hydrogen sulfide solution decreased as temperature rose. At 15 ℃-25 ℃, hydrogen sulfide solution was stable when pH no less than 11; the solution stability decreased as pH decreased when pH less than 11; when the concentration of NaOH was at 20 mmol·L-1, even if S2- concentration was as low as 1 μg·L-1, hydrogen sulfide solution was stable for at least 30 days.