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Solvents (HPLC & GC)

AR & ACS Grade Solvents

AR, GR and ACS reagent-grade solvents for titration, extraction, sample preparation and general analytical work, with full lot COAs.
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Not every analytical task needs chromatography-grade solvent. Extractions, titrations in non-aqueous media, sample dilution and UV-free wet chemistry run perfectly well on AR, GR and ACS grades, at a lower cost. This sub-category lists those reagent-grade solvents, including 1,4-Dioxan GR 99%+, 1-Methyl 2-pyrrolidone GR 99%+, 1,2-Dichlorobenzene GR 99%+ and 1-Butanol GR 99%+.

Reagent grades are specified by assay, water content, residue on evaporation and limits for named impurities such as acids, aldehydes or peroxides. ACS grade follows published American Chemical Society specifications, while AR and GR grades follow manufacturer limits that are often comparable. Pick the grade your SOP or pharmacopoeia names, and use HPLC grade only where the method needs it.

Packs are mostly 500 mL to 2.5 L glass bottles, with larger metal or HDPE containers for routine users. Solvents that form peroxides are supplied stabilised unless stated otherwise. Each lot travels with its COA and SDS.

AR & ACS Grade Solvents: questions buyers ask

Can AR grade solvent replace HPLC grade in a chromatography method?
Sometimes for isocratic work at higher wavelengths, but rarely for gradient or low-UV methods. AR grades are not tested for UV absorbance or gradient performance and may give noisy baselines. Validate any substitution and check whether your regulated method allows it before switching grades.
How should ethers such as dioxan be checked for peroxides?
Test opened containers regularly with peroxide test strips or an iodide test, especially before distillation or evaporation. Peroxides concentrate as the solvent evaporates and can become dangerous. Date each bottle on opening, store it away from light and heat, and dispose of old stock that shows significant peroxide levels.
What is listed on the COA for a reagent-grade solvent?
Typical COA items are assay by GC, water by Karl Fischer, residue on evaporation, colour, density and limits for named impurities such as acidity or carbonyl compounds. The parameters depend on the solvent and grade. The COA for your lot is supplied with the shipment and can be requested in advance.

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