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９９４年９月采集了珠江口表层海水水样，并对其溶解态的Ｋ＋、Ｎａ＋、Ｃａ２＋、Ｍｇ２＋、ＳＯ２－４、Ｃｌ等化学要素进行了测定。结果表明，珠江口调查海域表层水中溶解态的Ｋ＋、Ｎａ＋、Ｃａ２＋、Ｍｇ２＋、ＳＯ２－４主要受陆源淡水与外海水物理混合稀释的影响，与Ｃｌ具有良好的直线正相关；Ｃａ２＋／Ｃｌ、ＳＯ２－４／Ｃｌ明显高于大洋水相应比值，Ｎａ＋／Ｃｌ、Ｍｇ２＋／Ｃｌ略高，而Ｋ＋／Ｃｌ比大洋比值低；在与中国其它各主要河口表层水对应Ｃｌ比较中，珠江口的ＳＯ２－４／Ｃｌ较高，而Ｃａ２＋／Ｃｌ，Ｍｇ２＋／Ｃｌ比值居低；上述各主要常量离子和Ｃｌ的等值线均沿自北向南走向递增。
Seawater samples from the surface of the Pearl River Estuary were collected in September 994, and chemical elements such as K +, Na +, Ca2 +, Mg2 +, SO2-4 and Cl were measured. The results showed that the dissolved K +, Na +, Ca2 +, Mg2 + and SO2-4 in the surface waters of the Pearl River Estuary were mainly affected by the physical mixing and dilution of terrestrial freshwater and outlying sea water, and there was a good linear correlation between Cl and Ca2 + / Cl, SO2 -4 / Cl was significantly higher than the corresponding ratio of ocean water, Na + / Cl and Mg2 + / Cl were slightly higher, while K + / Cl ratio was lower than that of the oceanic. In comparison with the Cl corresponding to the surface water of other major estuaries in China, SO2- 4 / Cl is higher, and the ratio of Ca2 + / Cl and Mg2 + / Cl is lower. The contours of the above major constant ions and Cl increase along the trend from north to south.