Certified sediment reference materials for trace element analysis from the National Metrology Institute of Japan (NMIJ)

Inagaki, Kenji; Takatsu, Akiko; Kuroiwa, Takayoshi; Nakama, Atsuko; Eyama, Sakae; Chiba, Koichi; Okamoto, Kensaku

doi:10.1007/s00216-003-2327-x

Cited by 19 publications

(10 citation statements)

References 9 publications

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“…3 As a section of the National Metrology Institute of Japan (NMIJ), the authors' group has developed various CRMs for the analysis of food and environmental samples. [4][5][6][7][8][9][10][11][12] Before the development of the present CRM, there was no CRM developed with local tap water of Japan as the raw material. In the present work, local tap water was used as the raw material to prepare the CRM, which ensured the similarity of the matrix to the target sample in applications of the present CRM.…”

Section: Introductionmentioning

confidence: 94%

Development of a Certified Reference Material (NMIJ CRM 7203-a) for Elemental Analysis of Tap Water

et al. 2017

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A certified reference material (CRM), NMIJ CRM 7203-a, was developed for the elemental analysis of tap water. At least two independent analytical methods were applied to characterize the certified value of each element. The elements certified in the present CRM were as follows: Al, As, B, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, Pb, Rb, Sb, Se, Sr, and Zn. The certified value for each element was given as the (property value ± expanded uncertainty), with a coverage factor of 2 for the expanded uncertainty. The expanded uncertainties were estimated while considering the contribution of the analytical methods, the method-to-method variance, the sample homogeneity, the long-term stability, and the concentrations of the standard solutions for calibration. The concentration of Hg (0.39 μg kg -1 ) was given as the information value, since loss of Hg was observed when the sample was stored at room temperature and exposed to light. The certified values of selected elements were confirmed by a co-analysis carried out independently by the NMIJ (Japan) and the KRISS (Korea).

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Section: Introductionmentioning

confidence: 94%

Development of a Certified Reference Material (NMIJ CRM 7203-a) for Elemental Analysis of Tap Water

et al. 2017

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“…Two types of sediment reference material (NMIJ 7302-a and 7303-a) for trace element analysis were prepared and certified by the National Metrology Institute of Japan (NMIJ) (Inagaki et al 2004). The sediment materials were air-dried, sieved, homogenised, packaged in 1000 glass bottles (60 g each), and radiation sterilised.…”

Section: Development and Certification Of Reference Materialsmentioning

confidence: 99%

Reference Materials in Geoanalytical Research ‐Review for 2004 and 2005

Jochum¹,

Willbold²

2006

Geostandard Geoanalytic Res

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This review gives an overview of the use and development of reference materials of geochemical and environmental interest in the literature of the years 2004 and 2005. In these years the performance of existing methods has been improved and new geochemical applications using new techniques have been developed. Accordingly, there was an increasing need for new reference materials, especially for in situ microanalysis and for precise stable isotope measurements. In addition, there was a notable trend for further characterisation of existing reference materials, mainly for the platinum‐group elements. This review focuses on five topics: reference materials for platinum‐group elements, reference glasses for in situ microanalysis, zircon reference materials, isotopic reference materials, and the development and certification of reference materials.

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“…The mean ratio of the low to high elemental content in the duplicate samples was 0.97. Analytical precision was verified using certified standard materials designated as Pond Sediment (NIES CRM No.2) (Okamoto and Fuwa 1985) and Lake Sediment (NMIJ CRM 7303a) (Inagaki et al 2004). The relative standard deviations of five repeat analyses of the certified standard material, Pond Sediment, were less than 1.9% for all elements.…”

Section: Elemental Analysismentioning

confidence: 99%

Long-term observations of the vertical distributions of mineral elements and phosphorus dynamics in sediments in a shallow eutrophic lake in Japan

et al. 2018

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Purpose To explore the mechanisms in the deposition and release of phosphorus (P) in the sediment of a shallow eutrophic lake using preserved samples, we investigated the vertical and temporal changes in P, manganese (Mn), sulfur (S), iron (Fe), aluminum (Al), calcium (Ca), and magnesium (Mg) in the sediment samples and the phosphate in the sediment pore water samples over a period of 6 years. Materials and methods The upper 15 cm of sediment from Lake Kasumigaura in Japan was collected monthly from 2003 to 2008 from the center of the lake. Sediment cores were divided into seven depth segments and were acid-digested for an elemental analysis via inductively coupled plasma atomic emission spectroscopy. Phosphate concentrations of the sediment pore water were determined using the molybdenum blue method. A multiple regression analysis was conducted by setting the P content as the response variable and Mn, S, Fe, Al, Ca, and Mg as explanatory variables. Results and discussionThe results of the multiple regression analysis demonstrated that P co-precipitates with Fe and Al oxides and accumulates on the sediment surface. The vertical distributions of Mn and S suggest that Mn reduction occurs within the 0-1cm-depth layer of the sediment and that iron sulfide is actively formed in the 6-10-cm-depth layer of the sediment. These findings imply that the layer in which ferric oxides are reduced to ferrous ions is present near the 1-6-cm-depth layer of the sediment. This layer corresponds to the layer in which the maximum phosphate concentration of the sediment pore water often occurred (the 2-6-cm-depth layer). These results indicate that vertical distributions of mineral elements are useful for assessing P dynamics in sediments. Conclusions The lake sediments record the dynamics of P in the sediment. Our analytical approach using long-term observation data demonstrated that the accumulation and release of P associated with a change in the redox state can be assessed based on the vertical distributions of mineral elements in the lake sediments.

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Certified sediment reference materials for trace element analysis from the National Metrology Institute of Japan (NMIJ)

Cited by 19 publications

References 9 publications

Development of a Certified Reference Material (NMIJ CRM 7203-a) for Elemental Analysis of Tap Water

Development of a Certified Reference Material (NMIJ CRM 7203-a) for Elemental Analysis of Tap Water

Reference Materials in Geoanalytical Research ‐Review for 2004 and 2005

Long-term observations of the vertical distributions of mineral elements and phosphorus dynamics in sediments in a shallow eutrophic lake in Japan

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