Organic acid of the seawater and sediment in the Ariake Sea
2015
Nagasaki, K. | Mushiake, K. | Ikuta, K.
To obtain baseline data to detect and estimate the behavior of acid treatment agents in nori farms in the Ariake Sea, sea water and pore water in the bottom sediment were collected before and during acid treatment and organic acids contained in them were analyzed. High-performance liquid chromatography measurement (lower limit of quantification: 10 mg/L) was performed in primary screening, and samples exceeding the lower limit of quantification were reanalyzed by high-performance liquid chromatography-tandem mass spectrometry (lower limit of quantification: 1.0 mg/L). Out of 52 samples collected (47 sea-water samples and 5 pore water samples), lactic acid was detected from one sample of pore water in the sediment collected before acid treatment (measured values were 8.1 mg/L and 1.1 mg/L). The amounts of organic acids contained in the other 51 samples at all observation points were below the lower limit of quantification of the high-performance liquid chromatography. Further detailed investigation is required to identify the origin of lactic acid detected in the sample collected before acid treatment.
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