Influence of submarine fumaroles on the seasonal changes in mercury species in the waters of Kagoshima Bay, Japan

Tomiyasu, Takashi; Minato, Takuya; Ruiz, Wilder Leonardo Gamboa; Kodamatani, Hitoshi; Kono, Yuriko; Hidaka, Masayasu; Oki, K.; Kanzaki, Ryo; Taniguchi, Yoko; Matsuyama, Akito

doi:10.1016/j.marchem.2015.10.009

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…Long-term monitoring of the thermal condition inside the caldera showed that during summer through fall, the water column is stratified with a thermocline around 40-80 m deep (Tomo et al, 2017). The presence of a thermocline restricts the exchange of dissolved trace elements between water layers, as observed in the profile of hydrothermal mercury species in the water column (Tomiyasu et al 2015). We also observed a similar behavior in helium isotopes (Nakajima et al, 2022).…”

Section: Introductionsupporting

confidence: 78%

An easier approach for helium isotope flux estimation in a submerged caldera

Teresa Nakajima,

Takahata,

Obata

et al. 2024

Geochem. J.

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Wakamiko Caldera is an isolated basin located in the northern part of Kagoshima Bay. The underwater caldera is known for the active fumaroles that continuously discharge volcanic substances into the overlying water. Due to the limited exchange of waters in the caldera with the surrounding area, the water column gets stagnant and stratified from spring to autumn.Previous studies have shown that overturning occurs in the winter. Based on new data obtained by field observation in Wakamiko Caldera, we show that during winter, vertical mixing "resets" the helium isotope profile. After winter, as the water column regains its stratification, fluids with mantle helium slowly build up near the seafloor, resulting in the high 3 He/ 4 He ratio previously observed. We now use the temporal variation of 3 He/ 4 He ratio in different seasons to calculate the flux of 3 He. Using this method, we estimate the 3 He flux at approximately 0.013 mol/year.

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Section: Introductionsupporting

confidence: 78%

An easier approach for helium isotope flux estimation in a submerged caldera

Teresa Nakajima,

Takahata,

Obata

et al. 2024

Geochem. J.

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“…Parameters such as total suspended solid (TSS), total Hg (THg), dissolved Hg (DHg), particulate Hg (PHg), volatile Hg (Hg 0 , also often referred to as dissolved gaseous mercury), active Hg (which can be considered to mainly correspond to Hg 2+ [17]), and inactive Hg (Hg re , which is also referred to as residual Hg) were analyzed in the current study.…”

Section: Hg Analysismentioning

confidence: 99%

Study on Mercury Distribution and Speciation in Urban Road Runoff in Nanjing City, China

Singh

Kumar

et al. 2017

Water

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Abstract:The current study was aimed to investigate the mercury pollution in urban road runoff. A total of 34 rainfall events were monitored on 5 independent road catchments from 2015 to 2016 in Nanjing city, China. Events mean concentrations of mercury and the impact factors of mercury pollution in urban road runoff were also carried out in the current study. Results revealed that the concentration of various mercury species was very high. Total mercury, dissolved mercury and particulate mercury were found to be in the range of 0.173-8.254 µg/L, 0.069-6.823 µg/L, and 0.086-2.485 µg/L, respectively. The order of total mercury concentration among the five catchments was as follows: Longpan road > Xinjiekou > Jiulonghu > Zhujiang road > Maqun area. Results revealed the existence of different dominant species of mercury in different urban areas. Particularly, mercury in urban road runoff mainly existed in particulate form in Maqun area, and the concentrations of inactive mercury (0.250-2.821 µg/L) were far more than that of volatile mercury (0.023-0.215 µg/L) and active mercury (0.026-0.359 µg/L). The order of impact factors of rainfall characteristics on Hg pollution in runoff was dry periods > runoff time > duration of rainfall > storm intensity > rainfall. Analysis based on the first flush effect showed that the first flush phenomenon of mercury was not significant.

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“…To demonstrate the application of the developed method, we tested the concentrations of NO 2 – and NO 3 – in real seawater samples from Kagoshima Bay in southwestern Japan. Kagoshima Bay contains acidic seawater because of hydrothermal activity, which renders this region globally unique. , Previously, we observed that the mercury concentration of the seawater here is higher at greater depths owing to the development of a thermocline from August to October . It has also been suggested that nitrite-oxidizing bacteria present in seawater convert mercury to methylmercury .…”

Section: Resultsmentioning

confidence: 51%

“…43,44 Previously, we observed that the mercury concentration of the seawater here is higher at greater depths owing to the development of a thermocline from August to October. 45 It has also been suggested that nitrite-oxidizing bacteria present in seawater convert mercury to methylmercury. 46 Methylmercury is highly toxic and bioaccumulative, and its accumulation in humans through the consumption of contaminated fish and shellfish causes Minamata disease.…”

mentioning

confidence: 99%

Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System

Kodamatani

Kubo

Takeuchi

et al. 2023

Environ. Sci. Technol.

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Sensitive detection methods for nitrite (NO2 –) and nitrate (NO3 –) ions are essential to understand the nitrogen cycle and for environmental protection and public health. Herein, we report a detection method that combines ion-chromatographic separation of NO2 – and NO3 –, on-line photochemical conversion of these ions to peroxynitrite (ONOO–) by irradiation with a 222 nm excimer lamp, and chemiluminescence from the reaction between luminol and ONOO–. The detection limits for NO2 – and NO3 – were 0.01 and 0.03 μM, respectively, with linear ranges of 0.010–2.0 and 0.10–3.0 μM, respectively, at an injection volume of 1 μL. The results obtained by the proposed method for seawater analysis corresponded with those of a reference method (AutoAnalyzer based on the Griess reaction). As luminol chemiluminescence can measure ONOO– at picomolar concentrations, our method is expected to be able to detect NO2 – and NO3 – at picomolar concentrations owing to the high conversion ratio to ONOO– (>60%), assuming that contamination and background chemiluminescence issues can be resolved. This method has the potential to emerge as an innovative technology for NO2 – and NO3 – detection in various samples.

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Influence of submarine fumaroles on the seasonal changes in mercury species in the waters of Kagoshima Bay, Japan

Cited by 10 publications

References 37 publications

An easier approach for helium isotope flux estimation in a submerged caldera

An easier approach for helium isotope flux estimation in a submerged caldera

Study on Mercury Distribution and Speciation in Urban Road Runoff in Nanjing City, China

Sensitive Detection of Nitrite and Nitrate in Seawater by 222 nm UV-Irradiated Photochemical Conversion to Peroxynitrite and Ion Chromatography-Luminol Chemiluminescence System

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