Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Kurihara, Momo; Yasutaka, Tetsuo; Aono, Tatsuo; Ashikawa, N.; Ebina, Hiroyuki; Iijima, T.; Ishimaru, Kei; Kanai, Ramon; Karube, Zin’ichi; Konnai, Yae; Kubota, Tomijiro; Maehara, Yuji; Maeyama, Takeshi; Okizawa, Yusuke; Ota, Hiroaki; Otosaka, Shigeyoshi; Sakaguchi, Aya; Tagomori, Hisaya; Taniguchi, Keisuke; Tomita, Masatoshi; Tsukada, Hirofumi; Hayashi, Seiji; Lee, Sang Yoon; Miyazu, Susumu; Shin, Moono; Nakanishi, Takahiro; Nishikiori, Tatsuhiro; Onda, Yuichi; Shinano, Takuro; Tsuji, Hideki

doi:10.1007/s10967-019-06696-2

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…During the experiment, the relative standard deviation (RSD) was used to obtain repeatability and reproducibility as described in the literature [27]. The reproducibility (showing variability between the results from different laboratories) was assessed in a similar way as previously reported [27]. The detection limits were 0.2 mg/kg for Cd, Cr, and Pb, 0.05 mg/ kg for As, and 0.02 mg/kg for Hg.…”

Section: Location Of the Sampling Areasmentioning

confidence: 99%

Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania

et al. 2021

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This study investigated the levels of Pb, Hg, Cr, Cd, and As in water and sediments from the tributaries of the Mara River, Tanzania. Pollution risk of water and sediments was investigated using seven indices and five metals. During the dry period, the highest concentration of Pb, Hg, Cr, Cd, and As in sediments was 17.45 ± 1.22, 0.01, 1.56 ± 0.5, 1.3 ± 0.09, and 30.81 ± 0.02 mg/kg, respectively. During the wet period, the highest concentration of Pb, Hg, Cr, Cd, and As in sediments was 4.37 ± 0.28, 0.012, 2.58 ± 0.57, 2.25 ± 0.35, and 53 ± 0.02 mg/kg, respectively. For surface water, the respective highest concentrations of Pb, Hg, Cr, Cd, and As were 0.76 ± 0.09, 0.04, 0.68 ± 0.09, 0.74 ± 0.1, and 0.47 ± 0.06 mg/L for the dry period. The wet period max concentrations for Pb, Hg, Cr, Cd, and As in surface water were 0.56, 0.03, 0.55 ± 0.03, 0.48 ± 0.03, and 0.4 ± 0.03 mg/L, respectively. Principal component analysis results indicated dominant loadings for Pb and As in sediments during the dry period. Comparison of sediment concentrations with sediment quality guidelines revealed that As and Cd were enriched. Correlation coefficient results indicated that As had a strong negative correlation with the rest of the elements in sediments during the dry period. In the wet period, As had a significant correlation with Cd (r = 0.92, p < 0.01) in sediments. The analysis of environmental risks indicated significant enrichment of sediments with As and Cd. It is important to put in place relevant control mechanisms targeting metals in the studied tributaries, with a focus on As and Cd.

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Section: Location Of the Sampling Areasmentioning

confidence: 99%

Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania

et al. 2021

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“…The contamination by CsMPs would cause the variability of 137 Cs concentrations in sediment. 13 Since the size of the CsMPs is more than 1 μm, 34,35 care must be taken to avoid contamination by CsMPs in the particulate fraction.…”

Section: ■ Discussionmentioning

confidence: 99%

“…Considering that the activity concentration of total 137 Cs in lake water was less than 20 mBq/L on average, accidental contamination by CsMPs in the water sample resulted in the intense activity of 137 Cs. The contamination by CsMPs would cause the variability of 137 Cs concentrations in sediment . Since the size of the CsMPs is more than 1 μm, , care must be taken to avoid contamination by CsMPs in the particulate fraction.…”

Section: Discussionmentioning

confidence: 99%

“…To determine the activity concentration, 137 Cs in the dissolved fraction was concentrated by an ammonium molybdophosphate (AMP) coprecipitation method. 13 The formed AMP− 137 Cs compounds were transferred to a 50 mL polypropylene container and used as the dissolved 137 Cs sample. The lyophilized SS was transferred to a 50 mL polypropylene container and used as the particulate 137 Cs sample.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Factors of the slow decline in the activity concentration of ¹³⁷Cs in eutrophic lake water

Ishii,

Furota,

Tagami

et al. 2024

ACS EST Water

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We investigated the activity concentrations of dissolved 137Cs, particulate 137Cs, and total 137Cs (the sum of dissolved and particulate 137Cs) in Lake Inba, Japan, from 2019 to 2022 to predict the long-term decline in the 137Cs contamination. The effective half-lives of dissolved and total 137Cs were 2.9 and 18.1 years, respectively. We also observed no decreasing trend of particulate 137Cs. These results suggested that the more gradual decrease in the total 137Cs is caused by the small decline in particulate 137Cs. To decrease the total 137Cs, particulate 137Cs must be decreased. We found that the particulate 137Cs concentrations were correlated with the suspended solid (SS) and volatile suspended solid (VSS) concentrations and that the SS concentrations were positively correlated with the chlorophyll a concentrations. Phytoplankton, which are the chlorophyll a host, are classified into the particulate fraction, and thus, particulate 137Cs were contained in phytoplankton that had accumulated 137Cs. We think that phytoplankton is also an important component of particulate 137Cs in eutrophic lakes although the main factor determining particulate 137Cs concentration is inorganic SS. Since phytoplankton is a food resource for fish, it is necessary to examine in detail the relationship of 137Cs contamination of fish with particulate 137Cs and phytoplankton.

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Rapid concentration method for radiocesium in seawater using AMP-PAN resin and sample loading equipment

Kim,

Lim,

Kim

2024

J Radioanal Nucl Chem

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Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Cited by 6 publications

References 24 publications

Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania

Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania

Factors of the slow decline in the activity concentration of ¹³⁷Cs in eutrophic lake water

Rapid concentration method for radiocesium in seawater using AMP-PAN resin and sample loading equipment

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Repeatability and reproducibility of measurements of low dissolved radiocesium concentrations in freshwater using different pre-concentration methods

Cited by 6 publications

References 24 publications

Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania

Heavy metals risk assessment of water and sediments collected from selected river tributaries of the Mara River in Tanzania

Factors of the slow decline in the activity concentration of 137Cs in eutrophic lake water

Rapid concentration method for radiocesium in seawater using AMP-PAN resin and sample loading equipment

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Factors of the slow decline in the activity concentration of ¹³⁷Cs in eutrophic lake water