The stability of pH value in the waters of Jiaozhou Bay

Abstract

According to the survey materials in the waters of Jiaozhou Bay in May and October 1979, this article presents the pH value and horizontal distribution in the surface waters Jiaozhou Bay. The results indicate that the pH value in the waters of Jiaozhou Bay ranged within 7.55-8.79 in May and October. The pH value in the seawater was all greater than 7.50 in May and October. In addition, the interval length of the changes of pH value in the seawater was 1.24, which indicated that the overall pH value of the water body was within the normal range of variation in May and October. In May, the pH value ranged within 7.55-8.07. In Jiaozhou Bay, the pH value of seawater was relatively low. In the northeastern coastal waters, the pH value ranged within 8.02-8.07, which presented that the content of carbon dioxide and hydrogen ion in the surface seawater of this area was decreasing, causing the pH value of northeastern coastal waters to reach the highest value. In the waters inside of the bay, in the mouth of the bay, and outside of the bay, the variation range of pH value was 7.55-7.89, with the interval length of 0.05. It presented that the pH value in this area had reached the low value and was very stable. In October, the pH value ranged within 8.28-8.79. In Jiaozhou Bay, the pH value of seawater was relatively high, which presented that the content of carbon dioxide and hydrogen ion in the entire surface seawater of Jiaozhou Bay was very low, causing the pH value of entire waters to reach the highest value. Moreover, in the waters inside of the bay, in the mouth of the bay, and outside of the bay, the interval length of the variation of pH value was 0.05. It presented that the variation of pH value in this area was very small and stable.