Purity Evaluation of Alkylphenol Primary Standards Based on Japan Calibration Service System by Subtraction Method

Hanari, Nobuyasu; Ishikawa, Keiichiro; Yarita, Takashi; Otsuka, Satoko; Iwasawa, Ryoko; Fujiki, Naomi; Numata, Masahiko

doi:10.2116/bunsekikagaku.60.877

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…The mass balance method on alkylphenols was separately applied to techniques based on GC-FID/KFT/VE and based on HPLC-DAD/KFT/VE to validate obtained values. A reliability of applied mass balance method was confirmed in comparison with data from the mass balance method mentioned above and from the freezing point depression method on NP, HP, and DCP which were amenable to DSC [25]. By determining x CRM,kg , the appropriate management of the JCSS under ensuring the traceability to the NMIJ CRMs is feasible, though x CRM,kg was not traceable to the SI.…”

Section: Overview Of Certificationmentioning

confidence: 84%

Certification of reference materials for the determination of alkylphenols

et al. 2015

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Certified reference materials (CRMs) are playing an increasingly important role in national and international standardizing activities. In Japan, primary standard solutions for analyses of endocrine disrupters are supplied under the national standards dissemination system named the Japan Calibration Service System (JCSS). For the traceability on reference materials used for preparation of the primary standard solutions based on the JCSS, the National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ/AIST) has developed and certified high-purity reference materials of alkylphenols as NMIJ CRMs, such as 4-n-nonylphenol, 4-tert-octylphenol, 4-n-heptylphenol, 4-tert-butylphenol, and 2,4-dichlorophenol. Thereafter, it is essential to determine the alkylphenols by using these solutions based on the JCSS for environmental monitoring and risk assessments because analytical values obtained by using the solutions can ensure the reliability and traceability of the chemical analyses.

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Section: Overview Of Certificationmentioning

confidence: 84%

Certification of reference materials for the determination of alkylphenols

et al. 2015

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“…For most of metals (elements) and gases, it is the only practical measure for purity assessment. The method is also commonly used to assess purity of organic materials [15][16][17][18][19][20]. The 'purity' of commercial reagents expressed as 'GC%' or 'LC%' is given by a simple version of this approach.…”

Section: Mass Balance Approachmentioning

confidence: 99%

Conventional and new traceability schemes of organic standards for safe water supply in Japan

et al. 2019

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Metrological traceability to the International System of Units (SI) is required to ensure reliability of analytical results. For this purpose, SI-traceable standard solutions of respective analytes are essential for common analytical methods such as chromatography. However, it is not so easy to fulfill demands due to the existence of a vast number of targets, especially in the case of organic analysis. Because high-purity organic materials which are raw materials of standard solutions must be characterized by compound-independent methods, the mass balance approach (subtraction method) and the primary methods of measurement (e.g. the freezing point depression method and titrimetry) are used. Recently, quantitative NMR (qNMR) has been popularized.

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“…From the results of the purity assay by the freezing point depression method using continuous scan mode, [14][15][16][17] the impurity concentration was obtained to ca. 0.1 mmol mol -1 , and the value was simultaneously consistent with the degree of freezing point depression.…”

Section: Assay For Purity Of Water Used For Certificationmentioning

confidence: 99%

“…Therefore, the impurity concentration detected by DSC was considered to be 0, and its uncertainty was considered to be 0.29 mmol mol -1 , which was estimated from the rectangular distribution of 0.999 -1.000 mol mol -1 . 16 From the results of the purity assay by the subtracting method, the residue after evaporation was less than the detection limit (10 μg g -1 ). Furthermore, the dissolved gases are assumed to have achieved equilibrium with the atmosphere; in accordance with the reported values of the contents of dissolved nitrogen, oxygen, and carbon dioxide at 20 and 30 C, the purity value and its uncertainty were estimated from the rectangular distribution between the two temperatures (23.8 ± 1.0 μg g -1 ).…”

Section: Assay For Purity Of Water Used For Certificationmentioning

confidence: 99%

Characterization of Certified Reference Material for the Quantification of Water in Bioethanol

et al. 2012

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The National Metrology Institute of Japan has issued a certified reference material of bioethanol (NMIJ CRM 8301-a) for the quantification of water, methanol, sulfur, and copper. This paper presents technical details for the characterization of the water in NMIJ CRM 8301-a. The characterization was performed using coulometric and volumetric Karl-Fischer (KF) titrations. To reduce moisture absorption, sample handling and KF titration were performed in a glove box under a dried nitrogen atmosphere. In addition, a rubber cap with a three-way valve was attached to the ampoule immediately after opening so as to minimize the influence of moisture. Sample aliquots were obtained using a gas-tight microsyringe through the valve, and injected into the KF cell as soon as possible. The certified value of water obtained from coulometric and volumetric KF titrations was 1.688 mg g -1 , and the expanded uncertainty (coverage factor, k = 2) was 0.028 mg g -1 . This CRM would be suitable for the monitoring of water in bioethanol and similar matrices.

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Purity Evaluation of Alkylphenol Primary Standards Based on Japan Calibration Service System by Subtraction Method

Cited by 4 publications

References 7 publications

Certification of reference materials for the determination of alkylphenols

Certification of reference materials for the determination of alkylphenols

Conventional and new traceability schemes of organic standards for safe water supply in Japan

Characterization of Certified Reference Material for the Quantification of Water in Bioethanol

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