Development of certified reference materials of high-purity volatile organic compounds: purity assay by the freezing-point depression method

Shimizu, Yoshitaka; Ohte, Yoko; Bao, Xinnu; Otsuka, Satoko; Kitamaki, Yuko; Ishikawa, Keiichiro; Ihara, Toshihide; Kato, Kenji

doi:10.1007/s00769-008-0389-3

Cited by 26 publications

(24 citation statements)

References 9 publications

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“…The purity of the CRM was also determined by a freezing point depression method with a DSC using a stepwise scan method 4) . The freezing point depression method can be used to evaluate the substance fraction of total impurities from only physical quantities, such as temperature and enthalpy change 4) .…”

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

“…The freezing point depression method can be used to evaluate the substance fraction of total impurities from only physical quantities, such as temperature and enthalpy change 4) . Fusion is generally utilized for purity assay by a freezing point depression method, in spite of the method name.…”

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

“…And ΔT and T0 were evaluated by regression analysis from the relationship between the temperature and ratio of liquid phase in the sample during fusion. ΔfusH was measured by a continuous scan method with a DSC 4) . R is the literature value 9) .…”

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

“…The combined standard uncertainty of the purity by the freezing point depression method was estimated from the standard uncertainties of parameters in Eq. (4), that is, amount of substance fraction of impurities in the sample, melting point depression, gas constant, molar fusion enthalpy, and melting point of the pure substance. Table 2 shows the uncertainty budget for the purity by the freezing point depression method.…”

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

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Development of High Purity Dibutyl Sulfide Certified Reference Material (NMIJ CRM 4221-a) for Determination of Sulfur in Fuels

祐子

由隆

恵美子

et al. 2014

J. Jpn. Petrol. Inst.

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To obtain reliable analytical values of sulfur in fuels, sulfur standard solutions must be prepared accurately. A sulfur certified reference material in high purity sulfur compound, NMIJ CRM 4221-a (dibutyl sulfide), has been issued by National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ, AIST). The purity of dibutyl sulfide was determined by a freezing point depression method and a mass balance method. The certified value for sulfur content (mass fraction) was based on the purity, molecular weight, atomic weight, and impurities containing sulfur. The certified value (sulfur content) and its expanded uncertainty (k＝2) are 0.21919 kg kg -1 and 0.00006 kg kg -1 , respectively. The details of procedures for determination of the certified value are reported here.

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Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

Section: 2 Freezing Point Depression Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Development of High Purity Dibutyl Sulfide Certified Reference Material (NMIJ CRM 4221-a) for Determination of Sulfur in Fuels

祐子

由隆

恵美子

et al. 2014

J. Jpn. Petrol. Inst.

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“…However, since the raw material used was potassium salt of PFOS (K-PFOS) that could be readily refined, the melting point was extremely high (about 300 °C), and it was difficult to obtain accurate results using the purity assessment by the freezing point depression method [36]- [39] (about 150 °C or less) developed by NMIJ.…”

Section: Feedback For the Effort On The International Regulation Of Hmentioning

confidence: 99%

Standardization of environmental analysis methods of hazardous chemicals

Taniyasu

Hanari²,

Horii

et al. 2013

Synthesiology English edition

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of hazardous substances which becomes the basis for the discussion in the Stockholm Convention on Persistent Organic Pollutants (hereinafter, POPs Convention). However, the individual analysis methods and the quality assurance and quality control (QA/QC) of each chemical are rarely discussed in detail, and presently, the quality and reliability of these analyses are not thoroughly considered.In the global environmental issue, it is essential that any value, such as the concentration of CO 2 in the atmosphere causing global warming, measured in any part of the world, can be considered reliable and mutually comparable. To achieve this goal, we aimed to develop an analysis method with high reliability, and establish the international standard for the analysis method for the environmental researchers and analysts around the world. We also aimed to create a certified reference material (CRM), so the analysis value will be traceable to the SI unit. As a reference concerning the standardization of the environmental analysis method, the system of ISO and JIS will be briefly explained below.

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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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Development of certified reference materials of high-purity volatile organic compounds: purity assay by the freezing-point depression method

Cited by 26 publications

References 9 publications

Development of High Purity Dibutyl Sulfide Certified Reference Material (NMIJ CRM 4221-a) for Determination of Sulfur in Fuels

Development of High Purity Dibutyl Sulfide Certified Reference Material (NMIJ CRM 4221-a) for Determination of Sulfur in Fuels

Standardization of environmental analysis methods of hazardous chemicals

Certification of reference materials for the determination of alkylphenols

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