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Na2SO3可以改善硫脲在碱性介质中的稳定性；增大金在其中的阳极极化。Na2SO3参与金在碱性硫脲溶液中阳极溶解的反应级数大于1，表明Na2SO3可以加速金在碱性硫脲溶液中的溶解，其原因被认为是电化学还原和催化作用。
Na2SO3 can improve the stability of thiourea in alkaline medium; increase the anodic polarization of gold in it. The reaction order of anodic dissolution of Na2SO3 participating gold in alkaline thiourea solution is greater than 1, indicating that Na2SO3 can accelerate the dissolution of gold in alkaline thiourea solution. The reason for this is believed to be electrochemical reduction and catalysis.