Faculty Profiles - MARUO Masahiro

Papers - MARUO Masahiro

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Phosphate oxygen isotope insights into the coupled distribution of phosphorus, iron, and manganese in lake sediments Reviewed

Takuya Ishida, Noboru Okuda, Shin-ichi Onodera, Mitsuyo Saito, Yusuke Tomozawa, Xin Liu, Naoshige Goto, Ken'ichi Osaka, Masahiro Maruo, Ichiro Tayasu, Syuhei Ban

Chemical Geology 683 122754 - 122754 2025.6

Spatio-temporal variations of orthophosphate in a large mesotrophic Lake Biwa; its implications for phytoplankton productivity Reviewed International coauthorship

Xin Liu, Rong Yi, Miwa Ohashi, Masahiro Maruo, Yasushi Iseri, Aimin Hao, Min Zhao, Syuhei Ban

Inland Waters 2025.1

Eggshell waste as a promising adsorbent for phosphorus recovery from wastewater: A review Reviewed International coauthorship

Protima Sarker, Xin Liu, Md. Shiblur Rahaman, Masahiro Maruo

Water Biology and Security 4 ( 1 ) 2024.11

Thermally modified bamboo-eggshell adsorbent for phosphate recovery and its sustainable application as fertilizer Reviewed International journal

Protima Sarker, Xin Liu, Naoki Hata, Hiroki Takeshita, Hiroshi Miyamura, Masahiro Maruo

Environmental Research 231 ( Part 1 ) 115992 2023.8

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Participation form：Joint(The main charge)

Phosphate recovery from wastewater using readily available biowaste-based adsorbents is beneficial for both eutrophication control and waste management. Bamboo char has a high-density porous structure and eggshell contains CaCO3 with high affinity for phosphate. The combination of calcined bamboo and eggshell is a potential adsorbent for P recovery that has not been tested previously. Because bamboo char and eggshell both are popular for soil amendment, a P-loaded bamboo and eggshell composite is a promising fertilizer for long-term soil improvement. In this work, the feasibility of calcined bamboo and eggshell (BE) for P recovery and its use as fertilizer were investigated. The adsorption capacity and mechanism were examined using adsorption kinetic, isotherm, and thermodynamic analysis. The kinetic study showed that the experimental data sets were fitted best by a pseudo second-order model, indicating chemisorption. The Langmuir isotherm model estimated maximum adsorption capacities of 95.14 and 98.40 mg/g for BE 1:1 and 2:1 adsorbent. Monolayer adsorption occurred on a homogenous surface. The adsorption reaction was non-spontaneous at 298 K and exothermic for the BE 1:1 and 2:1 adsorbent, and the calculated Langmuir separation factor indicated favorable conditions for P adsorption. The desorption study showed lower P desorption capacity in water than in neutral ammonium citrate. P-loaded eggshell-modified bamboo char was an effective slow-release fertilizer for Japanese mustard spinach cultivation, which is a sustainable and environment friendly use of P-loaded materials.

DOI： 10.1016/j.envres.2023.115992

Scopus

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Assessment of Heavy Metals pollution and contamination in Sediment of the Dhaleswari River, Bangladesh Reviewed International journal

Abdullah Al Mamun, Protima Sarker, Md. Shiblur Rahaman, Md. Mahbub Kabir, Masahiro Maruo

International Journal of Environment 10 ( 1 ) 1 - 19 2021.7

Grain size distribution and chemistry of the brackish Lake sediment in Korea Reviewed International journal

I Chan Shin, Tetsuji Akatsuka, Hisayuki Azumi, Lan Ao, Nozomi Amahashi, Maki Oyagi, Noriko Ishida, Naoshige Goto, Masahiro Maruo, Akihiko Yagi, Yashshi Seike, Seung Hyun Lee, Sung Ae Yoon, Jun Kil Choi, Young Woong Byeon, Byung Mo Lee, Osamu Mitamura,Kwang Jin Cho

Environmental Engineering Research 26 ( 5 ) 200365 - * 2020.10

Dual stable isotope characterization of excess methane in oxic water of a mesotrophic lake Reviewed International journal

UrumuTsunogai, Yuko Miyoshi, Toshiyuki Matsushita, Daisuke D. Komatsu, Masanori Ito, Chiho Sukigara, Fumiko Nakagawa, Masahiro Maruo

Limnology and Oceanography 65 ( 2 ) 2937 - 2952 2020.7

Differences in dissolved phosphate in shallow-lake waters as determined by spectrophotometry and ion chromatography Reviewed

Yi R., Song P., Liu X., Maruo M., Ban S.

Limnology 21 ( 3 ) 329 - 339 2019.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Participation form：Joint(The vice charge)

© 2019, The Japanese Society of Limnology. Phosphorus (P) plays important roles in aquatic ecosystems, but accurately determining phosphorus species (particularly bioavailable phosphate) is difficult. When phosphate concentrations are spectrophotometrically measured as soluble reactive P (SRP), the actual values are often overestimated. Ion chromatography is one method for accurately measuring orthophosphate concentrations. To clarify how the spectrophotometrical measurement overestimates actual phosphate concentrations, we compared estimates of phosphate concentrations in lake waters using both methods. SRP and orthophosphate concentrations in water samples collected from four shallow lakes around Lake Biwa, Japan, were determined monthly for 1 year by spectrophotometry and ion chromatography, respectively. SRP concentrations were frequently higher than those for orthophosphate in all lakes throughout the study period, suggesting that SRP and orthophosphate are not equivalent, although a significant relationship was found between them. Orthophosphate/SRP (ortho/SRP) ratios varied spatiotemporally in all lakes (range 0.11–1.04; mean 0.56), being well predicted by biological-mediated relevant parameters using a stepwise multiple logistic regression analysis (R 2 = 0.76). The results implied that organic matter associated with biological activity contributes to the variability in ortho/SRP ratios. Such large variability in ortho/SRP ratios emphasizes the importance of accurate orthophosphate estimates for understanding P dynamics in aquatic ecosystems.

DOI： 10.1007/s10201-019-00574-2

Scopus

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Determination of trace methylphosphonate in natural waters by ion chromatography Reviewed

Tsuji K, Maruo M, Obata H

68 ( 4 ) 275 - 278 2019.4

Determination of dissolved and particulate thiols in Lake Biwa water and extracted fulvic acids by solid phase extraction followed by HPLC with fluorescence detection Reviewed

Rasheduzzaman Md., Mai Kawaguchi, Hajime Obata, Masahiro Maruo

Limnology 19 ( 3 ) 299 - 309 2018.8

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Limnology

© 2018, The Japanese Society of Limnology. Thiols are important antioxidants that can modulate the bioavailability and biogeochemistry of many soft metals, although their detection remains challenging in both their reduced (R–S) and oxidized (R–S–S–R) forms. Here, a modified biochemical method was applied to determine the levels of dissolved and particulate thiols in Lake Biwa water and extracted Lake Biwa fulvic acids obtained at various depths. This method involves the use of the reducing agent tris(2-carboxyethyl)phosphine and the fluorescent label 7-fluorobenzofurazan-4-sulfonic acid ammonium salt (SBD-F), followed by solid-phase extraction and HPLC with fluorescence detection. Dissolved cysteine (Cys) (2.0–6.0 nM), glutathione (GSH) (2.8–5.1 nM), and N-acetyl-l-cysteine (NAC) (1.6–4.2 nM) were detected throughout the water column but were broadly consistent at depths of 5–20 m. In contrast, abundant levels of particulate cysteine (1.3–3.5 × 102nM) and glutathione (1.6–3.1 × 102nM) were detected down to depths of 15 m. The particulate cysteine and glutathione were significantly covariant, and the ratios between them reflected the differences in the plankton community composition and availability of these compounds. This work also studied the concentrations of Cys, GSH and NAC in Lake Biwa fulvic acids (LBFAs) for the first time (at 0 m: cysteine, 0.8 nM; glutathione, 1.6 nM; NAC, 2.5 nM; at 10 m: cysteine, 1.4 nM; glutathione, 0.6 nM; NAC, 1.6 nM). The nanomolar to sub-nanomolar concentrations of the particulate and dissolved Cys, GSH and NAC in the lake indicates that these are an important class of ligands for chalcophile metals and may influence the distribution of plankton communities from the epilimnion to the hypolimnion of the lake.

DOI： 10.1007/s10201-018-0547-1

Scopus

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Assessment of the Status of Groundwater Arsenic at Singair Upazila, Manikganj Bangladesh; Exploring the Correlation with Other Metals and Ions Reviewed

Md. Mostafizur Rahman, Rebeka Sultana, Mashura Shammi, Joti Bikash, Tanveer Ahmed, Masahiro Maruo, Masaaki Kurasaki, M. Khabir Uddin

Exposure and Health 8 ( 2 ) 217 - 225 2016.2

Trace elements influenced by environmental changes in Lake Biwa: (I) Seasonal variations under suboxic hypolimnion conditions during 2007 and 2009 Reviewed

Yusuke Nakashima, Akiyoshi Shimizu, Masahiro Maruo, Yoshiki Sohrin

Limnology 17 ( 2 ) 151 - 162 2016.1

Trace elements influenced by environmental changes in Lake Biwa: (II) Chemical variations in the hypolimnion over the last half-century Reviewed

Yoshiki Sohrin, Yusuke Nakashima, Masahiro Maruo

Limnology 17 ( 2 ) 163 - 173 2016.1

Determination of aquatic humic substances in Japanese lakes and wetlands by the carbon concentration-based resin isolation technique Reviewed

Kumiko Tsuda, Morimaru Kida, Suzuka Aso, Taku Kato, Nobuhide Fujitake, Masahiro Maruo, Kazuhide Hayakawa, Mitsuru Hirota

Limnology 17 ( 1 ) 1 - 6 2015.12

Comparison of soluble reactive phosphorous and orthophosphate concentrations in river waters Reviewed

Masahiro Maruo, Mana Ishimaru, Yuma Azumi, Yuki Kawasumi, Osamu Nagafuchi, Hajime Obata

Limnology 17 ( 1 ) 7 - 12 2015.12

Annual layers in river-bed sediment of a stagnant river-mouth area of the Kitagawa Brook, Central Japan Reviewed

Yoshimasa Kurashige, Toshiaki Nakano, Eri Kasubuchi, Masahiro Maruo, Hanako Domitsu

IAHS-AISH Proceedings and Reports: International Symposium on Sediment Dynamics: From the Summit to the Sea, ICCE 2014; Astor Crowne PlazaNew Orleans; United States; 11 December 2014 through 14 December 2014; Code 115823 367 251 - 257 2014.12

Environmental Education in a Lagoon Naiko "Nishinoko", connected with Lake Biwa Reviewed

Mitamura O, Ishikawa S, Ishida N, Goto N, Tachibana J, Maruo M

Limonological Study 1 ( 1 ) 5 - 15 2014.7

Characteristics and role of groundwater dissolved organic matter on arsenic mobilization and poisoning in Bangladesh Reviewed

Tareq S. M., M. Maruo, K. Ohta

Physics and Chemistry of the Earth, Parts A/B/C 58-60 77 - 84 2013.5

Binding interactions of 1-naphthol with dissolved organic matter of Lake Biwa and treated sewage wastewater: the role of microbial fulvic acid Reviewed

Tanveer Ahmed, Keiichi Ohta, Osamu Nagafuchi, Masahiro. Maruo

Environmental Toxicology & Chemistry 31 ( 10 ) 2201 - 2209 2012.5

Seasonal characteristics of surface water fulvic acids from Lake Biwa and Lake Tankai in Japan Reviewed

Fujitake N., K. Tsuda, S. Aso, H. Kodama, M. Maruo, K. Yonebayashi

Limnology 13 ( 1 ) 45 - 53 2012.4

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Papers - MARUO Masahiro