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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Result of the standard addition method for seawater. The x-coordinate of the point where the straight line intersects the horizontal axis is approximately −630 ng. The error bars represent the standard deviations of the results obtained from six samples.