研究了10种不同杂质对硫酸钾水溶液亚稳区宽度的影响,计算了在杂质存在条件下体系成核特征值的变化。结果表明,三价离子Cr~(3+)、Fe~(3+)、Al~(3+)使亚稳区明显加宽;二价离子Cu~(2+)、Zn~(2+)、Mn~(2+)、Mg~(2+)使亚稳区变窄;而一价离子Li~+、NH_4~+、Na~+则分别使亚稳区变宽、变窄、不变。 The influence of 10 kinds of different impurities on the metastable zone width of potassium sulfate aqueous solution was studied. The variation of nucleation characteristic value in the presence of impurities was calculated. The results show that the metastable zone of Cr (3 +), Fe (3 +) and Al ~ (3+) , Mn ~ (2 +) and Mg ~ (2 +) narrow the metastable zone, while the monovalent ions Li ~ +, NH_4 ~ + and Na ~ + make the metastable zone wider and narrower, .