A precise and accurate method for the determination of inorganic boron in estuarine and coastal waters has been developed. The method takes into account the effects of ionic interactions in seawater on the electrode's junction potential, and on the ionization constant of the mannitol–borate complex. The analytical error is less than ±0.3% over the range of 0.35–4.45 mg B/kg seawater. This method, applied to 42 samples from the St. Lawrence Estuary, has allowed us to show that the B–Cl ratio varies in the region studied, and to localize regions that are deficient in dissolved inorganic boron.

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