Can AR grade be used to standardise a volumetric solution?

AR grade is fine for preparing volumetric solutions that you then standardise. To standardise them, use a primary standard material such as potassium hydrogen phthalate or sodium carbonate of certified purity, rather than relying on the AR assay alone.

Why do AR limits differ between suppliers?

Because AR is defined by each manufacturer rather than a public compendium. Two AR products may share an assay but list different impurities or limits. If a specific impurity matters to your method, check that it is named on the COA.

Is AR grade suitable for trace metal analysis?

Not usually. AR limits for metals are in ppm, while ICP-MS work needs ppb or ppt levels. For trace metal digestion and standards, choose a grade specified for trace analysis or an electronic grade acid.

Chemical grade

AR Grade (Analytical Reagent) chemicals

High-purity reagents with a minimum assay and named maximum limits for individual impurities, made for quantitative analysis.

1,435 products in this grade

AR Grade (Analytical Reagent) products

1,081–1,104 of 1,435 products

Potassium sodium tartrate, EP

CAS: 6381-59-5
Formula: C₄H₁₂KNaO₁₀
MW: 282.22 g/mol

ZX-038718

Potassium sodium tartrate, GR 99%+

CAS: 6381-59-5
Formula: C₄H₁₂KNaO₁₀
MW: 282.22 g/mol

ZX-007639

Potassium sulphate, BP/EP/Ph. Eur., ACS, AR

CAS: 7778-80-5
Formula: K₂O₄S
MW: 174.26 g/mol

ZX-038720

Potassium sulphate, GR 99%+

CAS: 7778-80-5
Formula: K₂O₄S
MW: 174.26 g/mol

ZX-013127

Potassium sulphite, GR 90%

CAS: 10117-38-1
Formula: K₂O₃S
MW: 158.26 g/mol

ZX-013130

Potassium tartrate

CAS: 6100-19-2
Formula: C₄H₆K₂O₇
MW: 244.28 g/mol

ZX-019469

Potassium tartrate, GR 98%+

CAS: 921-53-9
Formula: C₄H₄K₂O₆
MW: 226.27 g/mol

ZX-013132

Potassium tert-butoxide, 0.5 M in THF, AR

CAS: 865-47-4
Formula: C₄H₉KO
MW: 112.21 g/mol

ZX-037970

Potassium tetraoxalate, dihydrate, GR 99%+

CAS: 6100-20-5
Formula: C₄H₇KO₁₀
MW: 254.19 g/mol

ZX-003213

Potassium thiocyanate, GR 99%+

CAS: 333-20-0
Formula: CKNS
MW: 97.18 g/mol

ZX-013138

Potassium titanium fluoride, GR 98%+

CAS: 16919-27-0
Formula: F₆K₂Ti
MW: 240.05 g/mol

ZX-013144

Potassium titanium oxalate, GR 99%

CAS: 14402-67-6
Formula: C₄H₄K₂O₁₁Ti
MW: 354.13 g/mol

ZX-013146

Praseodymium oxide, GR 99.9%

CAS: 12037-29-5
Formula: O₁₁Pr₆-4
MW: 1021.44 g/mol

ZX-014570

Propane sulphonic acid sodium salt, AR, for HPLC

CAS: 14533-63-2
Formula: C₃H₇NaO₃S
MW: 146.14 g/mol

ZX-038128

Propionic acid, GR 99.5%+

CAS: 79-09-4
Formula: C₃H₆O₂
MW: 74.08 g/mol

ZX-001821

Propylamine, GR 99%

CAS: 107-10-8
Formula: C₃H₉N
MW: 59.11 g/mol

ZX-008612

Propylene glycol, GR 99%+

CAS: 57-55-6
Formula: C₃H₈O₂
MW: 76.09 g/mol

ZX-018395

Propylene Glycol, IP/BP/USP/EP/Ph. Eur., AR

CAS: 57-55-6
Formula: C₃H₈O₂
MW: 76.09 g/mol

ZX-038722

Propylene oxide, 99%+

CAS: 75-56-9
Formula: C₃H₆O
MW: 58.08 g/mol

ZX-018100

PyBOP, GR 99%

CAS: 128625-52-5
Formula: C₁₈H₂₈F₆N₆OP₂
MW: 520.4 g/mol

ZX-002428

Pyridine, AR, specially dried ≥99.5%

CAS: 110-86-1
Formula: C₅H₅N
MW: 79.1 g/mol

ZX-037234

Pyridine, GR 99%+

CAS: 110-86-1
Formula: C₅H₅N
MW: 79.1 g/mol

ZX-001823

Pyridinium dichromate, AR

CAS: 20039-37-6
Formula: C₁₀H₁₂Cr₂N₂O₇
MW: 376.2 g/mol

ZX-037593

Pyrocatechol violet

CAS: 115-41-3
Formula: C₁₉H₁₄O₇S
MW: 386.4 g/mol

ZX-000406

Compare with other grades

HPLC Grade GC Grade ACS Grade LR Grade (Laboratory Reagent)Extra Pure Grade Molecular Biology Grade Spectroscopy Grade LC-MS Grade IP Grade (Indian Pharmacopoeia)BP Grade (British Pharmacopoeia)USP Grade (United States Pharmacopeia)Ph. Eur. Grade (European Pharmacopoeia)Food Grade (FCC)Technical Grade Electronic Grade Deuterated and Stable-Isotope-Labelled Compounds Pharmaceutical Secondary Reference Standards Grades guide

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