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Anhydrous oxalic acid

Manufactured by Merck Group
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Sourced in Belgium, Portugal, Spain, France

Anhydrous oxalic acid is a colorless crystalline solid chemical compound with the formula C2H2O4. It is a common laboratory reagent used in various analytical and preparative applications.

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Lab products found in correlation

Ethanol, by Merck Group (2 mentions) Citric acid monohydrate, by Merck Group (2 mentions) Ethylene glycol, by Thermo Fisher Scientific (1 mentions) Ammonia solution, by Avantor (1 mentions) Lactic acid, by Avantor (1 mentions) Choline chloride, by Thermo Fisher Scientific (1 mentions) Hydrochloric acid (hcl), by Avantor (1 mentions) Methanol d4, by Merck Group (1 mentions) Aliquat 336, by Merck Group (1 mentions) Pbcl2, by Merck Group (1 mentions) Nitric acid, by Thermo Fisher Scientific (1 mentions) Lead 2 nitrate, by Merck Group (1 mentions) Nickel 2 nitrate hexahydrate, by Merck Group (1 mentions) 3 aminopropyltrimethoxysilane, by Merck Group (1 mentions) Ammonium hydroxide, by Merck Group (1 mentions) Cadmium nitrate tetrahydrate, by Merck Group (1 mentions) Ammonium hydroxide, by ITW Reagents (1 mentions) Zinc acetylacetonate, by Merck Group (1 mentions) Cobalt acetylacetonate, by Merck Group (1 mentions) Nickel acetylacetonate, by Merck Group (1 mentions)

6 protocols using anhydrous oxalic acid

1

Synthesis of Deep Eutectic Solvents

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Choline chloride (99%), ethylene glycol (99.5%), anhydrous FeCl3 (99%), anhydrous AlCl3 (99%) and LaCl3·7H2O (99.99%) were purchased from Acros Organics (Geel, Belgium). ZnCl2 (98%) was purchased from Chemlab-Analytical (Zedelgem, Belgium). Ethanol (99.9%), PbCl2 (98%), mEthanol-d4 (99.8%), Aliquat 336 (A336, a mixture of quaternary ammonium chlorides, with 88.2–90.6% quaternary ammonium content) and anhydrous oxalic acid (99%) from Sigma-Aldrich (Diegem, Belgium). Cyanex® 923 (C923, a mixture of trialkylphosphine oxides), Cyanex® 272 (bis(2,4,4-trimethylpentyl)phosphinic acid) were obtained from Cytec Solvay Group (New Jersey, USA), TBP (tri-n-butyl phosphate) from Alfa Aesar (USA). The aliphatic and aromatic diluents Shell GTL GS190 (C10–C13 aliphatic hydrocarbon diluent) and Shellsol A150 (C9–C11 aromatic hydrocarbon diluent) were obtained from Shell (Rotterdam, The Netherlands), ammonia solution (25%), hydrochloric acid (37%) and lactic acid (88%) from VWR International (Leuven, Belgium). All the chemicals were used as received, without any further purification. Ultrapure water (18.2 MΩ cm) was obtained by a Merck Millipore (Overijse, Belgium) Reference A+ Milli-Q water purification system.
Spathariotis S., Peeters N., Ryder K.S., Abbott A.P., Binnemans K, & Riaño S. (2020). Separation of iron(iii), zinc(ii) and lead(ii) from a choline chloride–ethylene glycol deep eutectic solvent by solvent extraction. RSC Advances, 10(55), 33161-33170.
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2

Silica-Based Heavy Metal Adsorbents

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Methyltriethoxysilane (MTES, ≥99%, Sigma-Aldrich, Darmstadt, Germany), tetraethylorthosilicate (TEOS, 98%, Sigma-Aldrich, Darmstadt, Germany), (3-aminopropyl)trimethoxysilane (APTMS, ≥97%, Sigma-Aldrich, Darmstadt, Germany), N1-(3-trimethoxysilylpropyl)diethylenetriamine (AAAPTMS, technical grade, Sigma-Aldrich, Darmstadt, Germany), 1-[3-(trimethoxysilyl)propyl]urea (UPTMS, 97%, Sigma-Aldrich, Darmstadt, Germany) and Tris[3 -(trimethoxysilyl)propyl] isocyanurate (TTMSI, >95.0%, Fluorochem, Derbyshire, United Kingdom) were used as silica sources. Methanol (99.8%, VWR International, Alfragide, Portugal) and ethanol (EtOH, ≥99.8%, Fisher, Porto Salvo, Portugal), anhydrous oxalic acid (≥99%, Sigma-Aldrich, Darmstadt, Germany), ammonium hydroxide (25% NH3 in H2O, Sigma-Aldrich, Darmstadt, Germany) were used as solvents and catalysts for the sol-gel chemistry. Heavy metal solutions were prepared using copper(II) nitrate hemipentahydrate (p.a., Chem-Lab, Zedelgem, Belgium), lead(II) nitrate (≥99.0%, Sigma-Aldrich, Darmstadt, Germany), cadmium nitrate tetrahydrate (≥99.0%, Sigma-Aldrich, Darmstadt, Germany), nickel(II) nitrate hexahydrate (crystals, Sigma-Aldrich, Darmstadt, Germany). High purity water was used whenever needed. Nitric acid (65%, Fisher) was used to adjust the solutions pH.
Vareda J.P., Valente A.J, & Durães L. (2020). Silica Aerogels/Xerogels Modified with Nitrogen-Containing Groups for Heavy Metal Adsorption. Molecules, 25(12), 2788.
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3

Synthesis of Silica-Polymer Composite Electrolytes

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Tetraethyl orthosilicate (TEOS, 98%, Acros Organics, Antwerpen, Belgium) and methyltriethoxysilane (MTES, 99%, Sigma-Aldrich, Darmstadt, Germany) were used as silica sources. Anhydrous oxalic acid (p.a., ≥99%, Sigma-Aldrich) and ammonium hydroxide (25% as NH3, PanReac, Barcelona, Spain) were used as sol–gel catalysts. Poly(vinyl alcohol) (PVA, Mw 72,000 Da, 85–89% hydrolysis, PanReac) was selected as the polymer and sodium perchlorate monohydrate (NaClO4·H2O, 85+% as NaClO4, Thermo Scientific Chemicals, Waltham, MA, USA) was used as sodium salt. Ethanol (EtOH, ≥99%, Valente e Ribeiro, Belas, Portugal) and high-purity water were used as solvents. All substances were used as received.
Vareda J.P., Fonseca A.C., Ribeiro A.C, & Pontinha A.D. (2024). Silica-Poly(Vinyl Alcohol) Composite Aerogel: A Promising Electrolyte for Solid-State Sodium Batteries. Gels, 10(5), 293.
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4

Synthesis of Metal Acetylacetonate Compounds

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Zinc acetylacetonate (Zn(AcAc)2; ≥95.0%), cobalt acetylacetonate (Co(AcAc)2; ≥99.0%), nickel acetylacetonate (Ni(AcAc)2; ≥99.0%), copper acetylacetonate (Cu(A0cAc)2; ≥99.0%), oxalic acid anhydrous (≥99.9%), hexadecyltrimethylammonium bromide (CTAB; ≥99.9%), polyethylene glycol (PEG; 10 000), carbamazepine and ethanol (absolute) were all purchased from Sigma Aldrich and used as provided. Jacketed, fritted funnels were purchased from Chemglass Lifesciences and fitted with PTFE sheets (Zwanzer). Desiccant from a Drierite™ gas-drying unit (Sigma-Aldrich) was used as provided by the manufacturer but transferred to a smaller tube.
Warren Z., Wenk J, & Mattia D. (2023). Increased photocorrosion resistance of ZnO foams via transition metal doping. RSC Advances, 13(4), 2438-2450.
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5

Epoxidized Linseed Oil-Chitosan Composites

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Epoxidized linseed oil (ELO; average molar mass = 980 Da; average functionality = 5.5 epoxides per triglyceride, viscosity~870 cPs/25 °C) was supplied by Valtris Specialty Chemicals (Manchester, UK). Chitosan (CHI; low molecular weight = 50–190 kDa; 84% deacetylated), oxalic acid anhydrous (OA; ≥99.0%), citric acid monohydrate (CA; ≥99.0%), and ethanol (EtOH; absolute, ≥99.8%) were purchased from Sigma Aldrich (Saint-Quentin-Fallavier, France). All chemical compounds were used as received without any further purification.
Fusteș-Dămoc I., Dinu R., Măluțan T, & Mija A. (2023). Valorisation of Chitosan Natural Building Block as a Primary Strategy for the Development of Sustainable Fully Bio-Based Epoxy Resins. Polymers, 15(24), 4627.
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6

Clofazimine Solubility Enhancement Protocol

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Clofazimine (CAS registry number 2030-63-9)
was purchased from Beijing Mesochem Technology Co., Ltd. Coformers,
including hydrochloric acid (37%, Sigma-Aldrich), sulfuric acid (95–97%,
Sigma-Aldrich), nitric acid (70%, Sigma-Aldrich), oxalic acid anhydrous
(>99%, Sigma-Aldrich), ortho-phosphoric acid (85%,
Sigma-Aldrich), citric acid monohydrate (>99%, Sigma-Aldrich),
formic
acid (acetic acid (>95%, Sigma-Aldrich)), and acetic acid (99.8%,
Sigma-Aldrich) were used as received. Methanol (>99%) being of
HPLC
grade and used without further purification was also purchased from
Sigma-Aldrich. Ingredients for the dissolution media; pepsin (extracted
from porcine mucosa, Amresco), sodium taurocholate hydrate (NaTc,
>97%, Sigma-Aldrich), L-α-phosphatidylcholine (lecithin,
∼
99% purity, from bovine brain, Sigma-Aldrich), sodium chloride (Fisher
Scientific), maleic acid (>99%, Sigma-Aldrich), and hydrochloric
acid
(37%, Sigma-Aldrich) were used as received from suppliers. Brain Heart
Infusion Broth (Sigma-Aldrich) was used as a medium for bioactivity
assays.
Bannigan P., Durack E., Madden C., Lusi M, & Hudson S.P. (2017). Role of Biorelevant Dissolution Media in the Selection of Optimal Salt Forms of Oral Drugs: Maximizing the Gastrointestinal Solubility and in Vitro Activity of the Antimicrobial Molecule, Clofazimine. ACS Omega, 2(12), 8969-8981.
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