Certification of reference materials of sodium tartrate dihydrate and potassium citric monohydrate for water content

Liu, Wei; Wang, Haifeng; Gu, Xifeng; Quan, Can; Dai, Xinhua

doi:10.1039/c5ay03067f

Cited by 7 publications

(9 citation statements)

References 17 publications

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“…Three decomposition stages were verified from the TGA spectrum between 250 and 550 °C after water loss (>200 °C). 64 These three primary decomposition stages are associated with the mixed products obtained from the CO 2 RR. The first and second stages (>350 °C) involve the decomposition of the tartrate ion into oxalate, 65 corresponding to ∼20% weight loss due to the detachment of gaseous CO 2 molecules from the tartrate crystal lattice.…”

Section: Resultsmentioning

confidence: 99%

K⁺ selectivity modulation in non-aqueous CO₂ electroreduction on lead catalysts: from oxalic to tartaric acid production

Arizono dos Reis,

da Silva,

Ribeiro

2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 99%

K⁺ selectivity modulation in non-aqueous CO₂ electroreduction on lead catalysts: from oxalic to tartaric acid production

Arizono dos Reis,

da Silva,

Ribeiro

2024

J. Mater. Chem. A

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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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“…In addition, the NMIJ has produced not only standard solutions but also matrixtype CRMs such as bioethanol and biodiesel fuels, the water con tent of which have been characterized [15,16]. On the other hand, NIM has succeeded in developing CRMs for water con tent in solids [17].…”

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

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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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Certification of reference materials of sodium tartrate dihydrate and potassium citric monohydrate for water content

Abstract: CRMs for water content in solids were used to calibrate Karl Fischer titrators or validate the measurement method for the accuracy and consistency of results.

Cited by 7 publications

References 17 publications

K⁺ selectivity modulation in non-aqueous CO₂ electroreduction on lead catalysts: from oxalic to tartaric acid production

K⁺ selectivity modulation in non-aqueous CO₂ electroreduction on lead catalysts: from oxalic to tartaric acid production

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

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

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Certification of reference materials of sodium tartrate dihydrate and potassium citric monohydrate for water content

Abstract: CRMs for water content in solids were used to calibrate Karl Fischer titrators or validate the measurement method for the accuracy and consistency of results.

Cited by 7 publications

References 17 publications

K+ selectivity modulation in non-aqueous CO2 electroreduction on lead catalysts: from oxalic to tartaric acid production

K+ selectivity modulation in non-aqueous CO2 electroreduction on lead catalysts: from oxalic to tartaric acid production

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

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

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K⁺ selectivity modulation in non-aqueous CO₂ electroreduction on lead catalysts: from oxalic to tartaric acid production

K⁺ selectivity modulation in non-aqueous CO₂ electroreduction on lead catalysts: from oxalic to tartaric acid production