Temperature effect on carbonic acid balance in water
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摘要: 本文通过理论分析和计算探讨了0~100℃范围内不同温度下的碳酸平衡问题,分析了H2CO3*、HCO3-和CO32-三种碳酸在不同温度和pH条件下的水中所占比例及分布规律。认为0~100℃范围内pH0在8.60~8.22之间变化,变化范围较小;三种碳酸在不同温度下随pH变化过程中所占比例存在差异,但差异也不大;在0~100℃范围内不管温度高低,均表现出酸性水中H2CO3*占优势,碱性水中CO32-占优势,偏酸、偏碱及中性水中HCO3-占优势;在较低pH下由于水中CO32-含量很少,因此用常规方法一般是难以检测到的。Abstract: Carbonic acid balance at 0~100℃ is studied based on theoretical analysis and calculation. Proportion and distribution of H2CO3*,HCO3- and CO32- in water at different temperature and pH value are elucidated. It is believed that the pH0 ranges slight, between 8.60~8.22 within 0~100℃, and that the proportion of three carbonates accounting for different ratios with the changes of the pH, but the difference is small. At any temperature between 0℃ and 100℃, H2CO3* dominates in acidic water, while CO32- in alkaline water and HCO3- in low acidic, low alkaline and neutral water. It is difficult for CO32- determination with traditional method for its low concentration under low pH value.
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Key words:
- temperature /
- carbonic acid balance /
- karst
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