Development of a Certified Reference Material “NMIJ CRM 4228-a” for the Determination of Water Content in Liquids

Inagaki, Shinsuke; Iwasawa, Ryoko; Hanari, Nobuyasu; Numata, Masahiko; Takatsu, Akiko

doi:10.2116/bunsekikagaku.67.619

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…Aqualyte GROA and Aqualyte CN were used as the generator electrolyte and counter electrolyte, respec tively. The conditions of the titration are the same as those in the procedure described in previous papers [13,14].…”

Section: Coulometric Kf Titrationmentioning

confidence: 99%

“…47.6 ± 0.9 mg g −1 , 10.01 ± 0.13 mg g −1 , 1.067 ± 0.024 mg g −1 , and 0.139 ± 0.012 mg g −1 , respectively (certified values ± expanded uncertainties (coverage factor, k = 2, gives a level of confidence of approximately 95%)). Also, in our former project at the National Metrology Institute of Japan (NMIJ), we devel oped CRMs for water content in liquids at the concentration of 0.1 mg g −1 (NMIJ CRM 4222a) and 1 mg g −1 (NMIJ CRM 4228a) [13,14]. Their water contents were 0.134 ± 0.004 and 0.996 ± 0.020 mg g −1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of water in methylcyclohexane as a certified reference material for determination of trace water content in liquids

Inagaki¹,

Suzuki²,

Asakai³

et al. 2019

Metrologia

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To ensure the accurate measurement of the water content in various materials, certified reference materials (CRMs) which are traceable to the International System of Units (SI) are required. The National Metrology Institute of Japan (NMIJ) has developed a CRM, water in methylcyclohexane (0.02 mg g−1), for quality control of trace water analyses in liquids. The water content of the CRM was determined by coulometric Karl Fischer titration as a primary method of measurements. The traceability of the electric charge applied on the titration was ensured to realize metrological traceability of the certified value to the SI. The uncertainties due to the analytical method, homogeneity, and long-term and short-term stabilities were evaluated and reflected in the uncertainty of the certified value. The certified value of the CRM was 0.018 mg g−1 and its expanded uncertainty, calculated using a coverage factor of k = 2, was 0.005 mg g−1. The new CRM can be applied for the validation of measurement instruments and procedures used in analyzing trace water. The technical details of the characterization of water in NMIJ CRM 4229-a are described in this paper.

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Section: Coulometric Kf Titrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of water in methylcyclohexane as a certified reference material for determination of trace water content in liquids

Inagaki¹,

Suzuki²,

Asakai³

et al. 2019

Metrologia

Self Cite

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“…Reference materials (RMs) for water content have certified values and can be used to validate the accuracy of analytical methods. ,,− Margolis et al have developed RMs of light sour crude oil (SRM 2721) and heavy sweet crude oil (SRM 2722), which had reference water content values of 134 and 99 mg/kg, respectively. , The reference values were determined using a modified KFCT method . When SRM 2721 was measured using the traditional KFCT method as described by the ASTM standard method (ASTM D 4928), the measured value was 941 mg/kg, which was much greater than the reference value (134 mg/kg), because of the side reactions of reducing compounds with iodine. , These two RMs were determined using only one method (the modified KFCT method), which does not conform to the requirements for the certification of RMs specified by ISO guide 35 .…”

Section: Introductionmentioning

confidence: 99%

Development and Application of Certified Reference Materials of Light Crude Oil for Water Content

Zheng,

Wang,

2023

ACS Omega

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The water content of the crude oil needs to be measured accurately. The analytical methods that are used, including distillation and Karl Fischer coulometric titration (KFCT), require verification using certified reference materials (CRMs) of crude oil for the water content. In the present study, five CRMs of light crude oil with large volumes and various certified water contents (1−10 mg/g) were developed using the gravimetric method. Each candidate CRM was prepared individually, including the addition of pure water to the dried blank crude oil and weighing the masses of the added water and the blank crude oil. The water content of the blank crude oil was measured using azeotropic distillation-KFCT (AD-KFCT). The certified water content for the CRM was calculated by using the water content of the blank crude oil, the masses of the added pure water, and the blank crude oil. The certified water content and the expanded uncertainty (U, k = 2) of the five CRMs were 1.12 (0.04), 2.14 (0.06), 3.14 (0.10), 5.14 (0.15), and 10.05 (0.27) mg/g. These CRMs were used to verify the accuracy of analytical methods, including distillation, KFCT, and AD-KFCT methods.

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Development of a Certified Reference Material “NMIJ CRM 4228-a” for the Determination of Water Content in Liquids

Cited by 2 publications

References 4 publications

Characterization of water in methylcyclohexane as a certified reference material for determination of trace water content in liquids

Characterization of water in methylcyclohexane as a certified reference material for determination of trace water content in liquids

Development and Application of Certified Reference Materials of Light Crude Oil for Water Content

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