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

1,057–1,080 of 1,435 products

Potassium iodate, GR 99%+

CAS: 7758-05-6
Formula: IKO₃
MW: 214 g/mol

ZX-013096

Potassium iodide, GR 99%+

CAS: 7681-11-0
Formula: IK
MW: 166 g/mol

ZX-013101

Potassium Iodide, IP/BP/USP/EP/Ph. Eur., AR

CAS: 7681-11-0
Formula: IK
MW: 166 g/mol

ZX-038710

Potassium iodo platinate, AR

CAS: 16905-14-9
Formula: I₆K₂Pt
MW: 1034.71 g/mol

ZX-037639

Potassium metabisulphite, BP/USP/EP/Ph. Eur., AR, food grade (FCC)

CAS: 16731-55-8
Formula: K₂O₅S₂
MW: 222.33 g/mol

ZX-038712

Potassium metabisulphite, GR 98%+

CAS: 16731-55-8
Formula: K₂O₅S₂
MW: 222.33 g/mol

ZX-013107

Potassium metal, AR

CAS: 7440-09-7
Formula: K
MW: 39.1 g/mol

ZX-038116

Potassium nitrate, 99.995%

CAS: 7757-79-1
Formula: KNO₃
MW: 101.1 g/mol

ZX-013110

Potassium nitrate, GR 99%+

CAS: 7757-79-1
Formula: KNO₃
MW: 101.1 g/mol

ZX-013112

Potassium nitrate, USP/EP/Ph. Eur., AR

CAS: 7757-79-1
Formula: KNO₃
MW: 101.1 g/mol

ZX-038713

Potassium nitrite, GR 98%+

CAS: 7758-09-0
Formula: KNO₂
MW: 85.1 g/mol

ZX-013115

Potassium oxalate, GR 99%+

CAS: 6487-48-5
Formula: C₂H₂K₂O₅
MW: 184.23 g/mol

ZX-007637

Potassium perchlorate, GR 99%+

CAS: 7778-74-7
Formula: ClKO₄
MW: 138.55 g/mol

ZX-000940

Potassium periodate, EP, AR

CAS: 7790-21-8
Formula: IKO₄
MW: 230 g/mol

ZX-038714

Potassium periodate, GR 99%+

CAS: 7790-21-8
Formula: IKO₄
MW: 230 g/mol

ZX-000942

Potassium permanganate, GR 99%+

CAS: 7722-64-7
Formula: KMnO₄
MW: 158.03 g/mol

ZX-013118

Potassium permanganate, USP, ACS, AR

CAS: 7722-64-7
Formula: KMnO₄
MW: 158.03 g/mol

ZX-037186

Potassium persulphate, GR 98%+

CAS: 7727-21-1
Formula: K₂O₈S₂
MW: 270.33 g/mol

ZX-000945

Potassium phosphate, dibasic, GR 99%+

CAS: 7758-11-4
Formula: HK₂O₄P
MW: 174.18 g/mol

ZX-003108

Potassium phosphate, monobasic, GR 99%+

CAS: 7778-77-0
Formula: H₂KO₄P
MW: 136.09 g/mol

ZX-003111

Potassium phosphate, tribasic, GR 98%+

CAS: 7778-53-2
Formula: K₃O₄P
MW: 212.27 g/mol

ZX-003114

Potassium pyroantimonate, GR 99%+

CAS: 12208-13-8
Formula: H₆KO₆Sb-2
MW: 262.9 g/mol

ZX-013120

Potassium pyrophosphate, AR

CAS: 7320-34-5
Formula: K₄O₇P₂
MW: 330.34 g/mol

ZX-038141

Potassium pyrosulphate, GR 99%+

CAS: 7790-62-7
Formula: K₂O₇S₂
MW: 254.33 g/mol

ZX-000948

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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