Development of a Certified Reference Material (NMIJ CRM 7505-a) for the Determination of Trace Elements in Tea Leaves

Zhu, Yanbei; Narukawa, Tomohiro; Inagaki, Kenji; Kuroiwa, Takayoshi; Chiba, Koichi

doi:10.2116/analsci.27.1149

Cited by 23 publications

(17 citation statements)

References 15 publications

(15 reference statements)

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“…8 All of the certified values and information values were obtained based on microwave acid digestions with dry-mass correction. The two-step microwave acid digestion procedure was carried out in the same way as that reported for the development of tea-leaf powder CRM, 8 except for that 0.3 g of the cand. RM was used for each sub-sample while 0.5 g of the sub-sample was used in the development of tea-leaf powder CRM.…”

Section: Apparatus For Processing the Samples And The Microwave Digesmentioning

confidence: 99%

“…16 Based on the test results, the between-bottle variance (sbb) and the possible between-bottle variance incorporating the influence of analytical variation (ubb) were calculated in a similar way to that reported in the development of a tea-leaf powder CRM. 8 A larger value of sbb and ubb was considered as the standard uncertainty of bottle-to-bottle homogeneity. Furthermore, the uncertainty of in-bottle homogeneity (uin-b) was estimated based on:…”

Section: Homogeneity Test and Stability Testmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] In recent years, NMIJ has provided proficiency tests using the candidate reference material (cand. RM) prior to issuing CRMs.…”

Section: Introductionmentioning

confidence: 99%

“…RM) prior to issuing CRMs. 8,10 Co-analysis, co-validation, and sharing of the cand. RMs have also been carried out by NMIJ in cooperation with the national metrology institutes of China and Korea, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…National Metrology Institute of China (NIM) and Korea Research Institute of Standards and Science (KRISS), respectively. 8,10 Thirteen nutrient elements including Na, Ca, and P are listed in the dietary reference intakes set by Japan. 11 On the other hand, As, Cd, Pb, Sn, and methyl Hg are regulated by the General Standard for Contaminants and Toxins in Foods (GSCTF) 12 proposed by the Codex Alimentarius Commission of the Food and Agriculture Organization (FAO) of the United Nations and the World Health Organization (WHO).…”

Section: Introductionmentioning

confidence: 99%

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Development of a Certified Reference Material (NMIJ CRM 7512-a) for the Determination of Trace Elements in Milk Powder

et al. 2013

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NMIJ has issued CRMs for trace elements in fish tissues, seaweed, rice flour, tea leaf powder, and soybean powder. Considering the fact that the consumption of milk-related food takes up approximately 11% of the total food consumption in Japan, 15 milk-related CRMs are required for quality control in the analysis of food samples. Development of milk-related CRMs in Japan are still required even though milk powder CRMs such as GBW 08509 (non-fat milk powder) and NIST SRM 1849a (infant/adult nutritional formula) are being issued respectively by NIM and the National Institute of Standards and Technology (NIST, USA). In the present work, the first milkrelated CRM by NMIJ, i.e. NMIJ CRM 7512-a, was developed for ensuring quality control in determining the elements in milk powder or similar matrices for food safety management and other relevant purposes. Because the analytical methods developed for previously reported CRMs were confirmed to be effective for the present CRM, the investigation of experimental conditions was mostly carried out to the dry-mass correction factor. The present paper reports the details on the development of this CRM, including the preparation of the cand. RM, the homogeneity test, investigation on the dry-mass correction factor, confirmation of the validity of the analytical methods, and calculation of the property values and the uncertainties.

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Section: Apparatus For Processing the Samples And The Microwave Digesmentioning

confidence: 99%

Section: Homogeneity Test and Stability Testmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] In recent years, NMIJ has provided proficiency tests using the candidate reference material (cand. RM) prior to issuing CRMs.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a Certified Reference Material (NMIJ CRM 7512-a) for the Determination of Trace Elements in Milk Powder

et al. 2013

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A comparative study of different methods for the determination of cadmium in various tissues of ramie (Boehmeria nivea L.)

Chen

Mou

Zhu

et al. 2023

Environ Monit Assess

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Remediation of cadmium (Cd) pollution is one of the priorities of global environmental governance and accurate detection of Cd content is a key link in remediation of Cd pollution. This study aimed to compare three methods (inductively coupled plasma optical emission spectrometry (ICP-OES), inductively coupled plasma mass spectrometry (ICP-MS), and graphite furnace-atomic absorption spectrometry (GF-AAS)) for the determination of Cd with different tissues of various ramie varieties, and distinguish the advantage and disadvantage of each method. In total, 162 samples of ramie (Boehmeria nivea L.), which is an ideal plant for heavy metal remediation, were detected and the results showed that the three methods were all suitable for the de-termination of Cd content in ramie. ICP-OES and ICP-MS were simpler, faster, and more sensitive than GF-AAS. ICP-MS could be recommended for the determination of samples with various concentrations of Cd. ICP-OES could be used for measurement of samples with > 100 mg/kg Cd content, while GF-AAS was suitable for the detection of samples with very high (> 550 mg/kg) or very low (< 10 mg/kg) Cd content. Overall, considering the accuracy, stability, and the cost of measurement, ICP-MS was the most suitable method for determination of Cd content. This study provides significant reference information for the research in the field of Cd pollution remediation.

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Characterization of a certified reference material (NMIJ CRM 8301-a) for determination of Cu in bio-ethanol

Zhu

Narukawa

Numata

et al. 2013

Fuel

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Development of a Certified Reference Material (NMIJ CRM 7505-a) for the Determination of Trace Elements in Tea Leaves

Cited by 23 publications

References 15 publications

Development of a Certified Reference Material (NMIJ CRM 7512-a) for the Determination of Trace Elements in Milk Powder

Development of a Certified Reference Material (NMIJ CRM 7512-a) for the Determination of Trace Elements in Milk Powder

A comparative study of different methods for the determination of cadmium in various tissues of ramie (Boehmeria nivea L.)

Characterization of a certified reference material (NMIJ CRM 8301-a) for determination of Cu in bio-ethanol

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