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The densities of 36 water samples from the Huanghe River estuary and Bohai Bay were determinedby a magnetic float densimcter under three temperatures from 15℃ to 25℃.All the measured densities ofsamples were greater than that of the values calculated from the International Equation of State of Seawater.The differences between the measured and calculated densities increased with the decrease of salinities.The dif-ferences appeared exponentially correlated with[Ca~(2+)]/s,[Mg~(2+)]/s and[SO_4~(2-)]/s,and had“s”type curverelationship with the alkalinity in all salinity range.But in the salinity ranging from 25.72 to 31.57,therelationships were all linear.The density difference can be estimated from the equation △ρ（10~3kg·m~(-3)）=（-2.79+236.5([Ca~(2+)]/s)/(-9.7464×10~（-3）+[Ca~(2+)]/s).It was the high alkalinity and[Ca~(2+)]/s that resulted in the measured densi-ties of seawaters being higher than the calculated densities in the Huanghe estuary and Bohai Bay.
The densities of 36 water samples from the Huanghe River estuary and Bohai Bay were determined by a magnetic float densimcter under three temperatures from 15 ° C. to 25 ° C. All measured values of the samples were compared to the values calculated from the International Equation of State of Seawater.The differences between the measured and calculated densities increased with the decrease of salinities.The dif-ferences have exponentially correlated with [Ca ~ (2 +)] / s, [Mg ~ (2 +)] / s and [SO_4 ~ (2 -)] / s, and had “s ” type curverelationship with the alkalinity in all salinity range.But in the salinity ranging from 25.72 to 31.57, therelationships were all linear.The density difference can be estimated from the equation △ ρ (10-3 kg · m -3) = - 2.79 + 236.5 ([Ca 2+ / s) / (9.7464 × 10 -3 + [Ca 2+] ] / s) .It was the high alkalinity and [Ca ~ (2 +)] / s that resulted in the measured densi-ties of seawaters being higher than the calculated densities in the Huanghe estuary and Bohai Bay.