必发·bf88(唯一)官方网站-登录入口

Chemical Reagents

Potassium thiosulfate hydrateCOA Report

CAS No.：13446-67-8
Molecular weight：196.33
Aliases：Potassium thiosulfate
Molecular formula：K₂S₂O₃·1/3H₂O
EC No.：233-666-8

Information

Specification category：

Product No.	Product name	specifications
1.01864.010	Potassium thiosulfate hydrate	CP500g
1.01864.020	Potassium thiosulfate hydrate	AR500g

Characteristic： Appearance and properties: Solid.
Relative density: 1.484(water=1)(20℃)
Technical indicators：

Item	AR	CP
Assay[K2S2O3·1/3H2O]	≥98.5%	≥98.0%
Clarity of solution	Pass	Pass
Insoluble matter	≤0.01%	≤0.015%
Sulfate and sulfite(as SO4)	≤0.2%	≤0.3%
Sulfide(S)	≤0.002%	≤0.004%
Calcium(Ca)	≤0.01%	≤0.01%

Related Products

Ammonium oxalate monohydrate

Silica gel self indicator

Sulfuric acid 68%

Magnesium oxide (light)

Sodium phosphomolybdate

Cobalt(II) chloride hexahydrate

GN enrichment broth

Zirconium dioxide

Sodium permanganate solution 40%

Ammonia solution

Copper(II) sulfate solution

Sodium hydrogen sulfate anhydrous

Humic acid

Potassium iodide

Potassium carbonate anhydrous

Sodium bromate

p-Toluenesulfonic acid monohydrate

Nitric acid 56-57%

Antimony trichloride

Dimethylammonium chloride

Sodium L-glutamate

Hydrazinium hydroxide 40%

Copper(II) oxide powder

Fluoroboric acid

2-Hydroxybenzaldehyde

Basic fuchsine (C.I.42510)

N,N-Diethyl-1,4-phenylenediammonium sulfate

Cetyltrimethylammonium bromide

Methanol absolute

Petroleum ether 30-60

1-Iodobutane

Potassium borohydride

Ethylene glycol monoethyl ether

Copper(II) bromide

DL-Aspartic acid

Ethylenediaminetetraacetic acid calcium disodium salt

alpha-Cyclodextrin

1-Naphthol

Tetraethylene pentamine

Chloroacetic acid

Calcium hydrogen phosphate dihydrate

2,2'-Bipyridine

n-Pentane

Aluminum potassium sulfate dodecahydrate

p-Toluenesulfonyl chloride

Ethyl lactate

iso-octanol

N-(1-Naphthyl)ethylenediamine dihydrochloride

Methyl orange (C.I.13025)

Ammonium benzoate

Sodium formate anhydrous

Potassium fluosilicate

Aluminum powder 100-200

Potassium fluoborate

Manganese(II) carbonate

Ammonium hydrogen carbonate

Potassium chloride

Octadecanoic acid

Tetrachloroethylene

Alizarin red (C.I.58005)

tetra-Sodium diphosphate decahydrate

Sulfuric acid

Polyethylene glycol 6000

Rose bengal

Methyl methacrylate

Thymol blue

Sodium hydrogen sulfate monohydrate

Eriochrome blue black R (C.I.15705)

Cyclohexane

Niobium pentaoxide

Chlorophosphonazo I

Hydrochloric acid 24-26%

Calcium acetate

Ethanolamine

Bismuth nitrate pentahydrate

Sodium molybdate dihydrate

Diethanolamine

Cadmium chloride

Acid fuchsin

Pararosaniline chloride

Merthiolate sodium

Sodium malonate

Copper(I) oxide

Ethylenediamine tetraacetic acid tetrasodium salt anhydros

Hydrazinium hydroxide 35%

Castor oil

Potassium carbonate crystal

Lead(Ⅱ) carbonate basic

Sodium salicylate

Aluminum powder

Ethylenediammonium dichloride

Diisopropylamine

Mannitol

Diethyl oxalate

1,1,1-Trichloroethane

Paraformaldehyde

N-Chlorosuccinimide

Ethylene glycol 65%

Sodium 1-heptanesulfonate

Silicone oil H201-350

Potassium stannate trihydrate

Sodium hydroxide solution 25%

Magnesium acetate tetrahydrate

Nitroethane

Barium chloride dihydrate

Indium granular

Tween 40

Agar rod

Diethylene glycol monobutyl ether

2-Thiobarbituric acid

Florisil

Hydrazinium hydroxide 55%

Nickel(II) sulfate hexahydrate

Martin medium modified

Kligler iron agar

Nickel(II) carbonate basic tetrahydrate

Potassium thiocyanate

Potassium bromide

Formaldehyde solution 28%

Tin powder

iso-Propanol 99.9%

Pepsin

Polyethylene glycol 600

N,N-Dimethyl-1,4-phenylenediammonium dichloride

Potassium peroxodisulfate

Thioacetamide

Cobalt(III) oxide

Copper(II) oxide wire

Chlorobenzene

Tetraethylammonium bromide

Lead(Ⅱ) sulfate

Potassium iodate

1-Dodecanethiol

Magnesium sulfate anhydrous

Manganese(II) acetate tetrahydrate

Dimethyl sulfoxide

DL-Methionine

Ethylene glycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetic acid

Polyethylene glycol 2000

Dodecanoic acid；Lauric acid

Cerium(III) nitrate hexahydrate

Sodium nitrite

Benzyl chloride

Nitrilotriacetic acid

Calcium carbonate

Copper(II) sulfate pentahydrate

Benzoyl hydrazine

Sodium thiosulfate standard volumetic solution

Sodium acetate trihydrate

Polyethylene-polyamines

Ethylenediaminetetraacetic acid magnesium disodium salt

Nitromethane

5% Benzalkonium bromide solution

Hydrazinium hydroxide 50%

1-Bromonaphthalene

Bismuth citrate

Sodium benzenesulfinate

p-Toluidine

Choline chloride

Sodium m-nitrobenzenesulfonate

ethyl silicate

Phosphotungstic acid

Sodium hydrogen phthalate

Copper(II) sulfate anhydrous

Strontium chloride hexahydrate

Methylammonium chloride

Sodium nitroferricyanide dihydrate

Trimethylchlorosilane

Zinc phosphate tetrahydrate

Triiodomethane

Calcium nitrate

Aluminum sheet

Manganese(II) chloride tetrahydrate

L-Histidine

Sodium hydrogen sulfite

Sodium perborate tetrahydrate

Potassium dichromate standard volumetic solution

Sodium sulfosalicylate

Urea

Wright's stain

Chloramine T trihydrate

Silver nitrate

Soda lime

Nickel(II) sulfamate solution

Phosphorus(V) oxide

Bromine

Polyvidone 25

Aluminum chloride anhydrous

Lead(Ⅱ) acetate trihydrate

Sodium 1-hexanesulfonate

N,N-Dimethylacetamide

Potassium tetraoxalate dihydrate

Acetonitrile

Ammonium phosphate

Peroxyacetic acid

Hydrazinium hydroxide 80%

Polyvinyl alcohol ammonium phosphate

Safranine T (C.I.50240)

Agar powder

3,3'-Dimethyldiphenylamine

Ammonium metavanadate

Indole-3-acetic acid

Sodium cobaltinitrite

n-Octanol

D-Mannose

Amberlite 717

Calcon carboxylic acid

Ammonium persulfate

Ethylenediamine tetraacetic acid dipotassium salt hexadrate

Iron(III) chloride hexahydrate

Lead(Ⅱ) carbonate

Cellulase Onozuka R-10

Tetramethylammonium hydroxide

m-Chloroaniline

Peptone

Lithium acetate dihydrate

D-Xylose

Potassium sodium citrate monohydrate

o-Cresolphtalein complexon

p-Nitrotoluene

6-Amino caproic acid

Lactic acid

Hydrogen peroxide 50%

Copper(I) iodide

Dimethyl yellow (C.I.11020)

Magnesium citrate tetradecahydrate

Polyethylene glycol 20000

Sodium tripolyphosphate / Sodium triphosphate

Ammonium molybdate tetrahydrate

Diisopropyl ether

Tin(II) chloride dihydrate

3-Nitrophenol

1,2-Dibromoethane

N-Methylmorpholine

Hydrochloric acid 18%

Tween 80

Sodium succinate hexahydrate

Ethylenediamine tetraacetic acid tetrasodium solution

Formaldehyde solution 30%

Thiosemicarbazide

Eosin Y (alcohol soluble) (C.I.45380.2)

1,4-Butanediol

Aluminum chloride basic solution 50%

Titanium trichloride solution

Gulaiacol

Potassium hydrogen tartrate

Nigrosine ( spirit soluble)

Methyl blue (C.I.42780)

Ethylenediamine tetraacetic acid disodium salt standard volumetic solution

Benzoyl chloride

Gum arabic

Disodium hydrogen phosphate anhydrous

Anthrone

Cadmium sulfate octahydrate

Iron(II) sulfate heptahydrate

Ethylene glycol dimethyl ether

Polyethylene glycol 200

Histamine

n-Butanol

Hydrochloric acid

Ponceau S (C.I. 27195)

Barium carbonate

Riboflavine

Sodium dodecylsulfate

Inositol

Petroleum ether 90-120

tert-Butyl methyl ether

Diphenyl ether

Sodium D-gluconate

1,2,3,4-Tetrahydronaphthalene

Phosphorus red

Iron standard solution for impurity

Sodium acetate anhydrous

Zinc standard solution for impurity

Salicylic acid

Cresol red

Bovine albumin

Ethylenediamine tetraacetic acid disodium salt

Indigo carmine (C.I. 73015)

Potassium hydroxide 48%

tri-Potassium phosphate trihydrate

Silver diethyldithiocarbamate

Copper foil

Cerium(IV) oxide

Alikali blue 6B (C.I.46725)

L-Cysteine hydrochloride anhydrous

Barium chromate

L-Histidine hydrochloride

Sodium tetraphenyl boron

Span 80

Sulfamic acid

Xylenol orange

Hydrochloric acid 33%

Methyl 4-hydroxybenzoate

Titan yellow (C.I.19540)

Cobalt(II) sulfate heptahydrate

1,10-Phenanthroline

Acetamide

Sodium hexametaphosphate

Butyric acid

Sodium hydroxide solution 50%

Span 20

Potassium dichromate

D-Fructose

Methyl violet (C.I.42535) Crystal Violet

Zirconium hydroxide

Hydrogen peroxide 35%

Nickel ammonium sulfate hexahydrate

Sodium stannate trihydrate

Sodium thiocyanate

4-(Dimethylamino)benzaldehyde

Tetrabutyl titanate

Propyl 4-hydroxybenzoate

Hydrochloric acid 20%

1,2-Propanediol

0.5% Dextrose broth

Chromotropic acid disodium salt

Rhodamine B

Hexamethyldisilazane

Trisodium citrate dihydrate

Triethylamine

Manganese(II) sulfate monohydrate

Tetrahydrofurfuryl alcohol

Benzenesulfonyl chloride

Lead standard solution for impurity

Peroxyacetic acid

Sodium fluoride

Potassium iodate standard volumetic solution

Sodium dihydrogen phosphate anhydrous

Silicon dioxide

Tween 20

Methylthymol blue

Potassium phosphate tribasic anhdrous

Sulfuric acid standard solution 0.1%

Zinc chloride

Potassium hydrogen oxalate

Methyl acetate

Peptone, fish powder

Ammonium sulfamate

Magnesium nitrate hexahydrate

Lead(Ⅱ) chloride

Formaldehyde solution 22.8%

Amido black 10B

Trypan blue

2,6-Di-tert-butyl-4-methylphenol

Iodine

5-(4-Dimethylaminobenzylidene)-rhodanine

Thiourea

Na-Benzoyl-L-arginine ethyl ester hydrochloride

1-Bromobutane

5-Sulfosalicylic acid dihydrate

1,2-Dichlomoethane

Calcium chloride anhydrous

Phenol

Hexamethylenetetramine

Barium peroxide

Methylamine alcohol solution

Polyvinyl alcohol

Orange G

Copper(II) formate hydrate

1-Naphthylamine

Lead(Ⅱ,Ⅳ) oxide red

tri-Potassium citrate monohydrate

Calcium chloride dihydrate

Lactose bile fermentation medium

Zinc acetate dihydrate

Fumaric acid

Dimethylamine water solution

Phthalic anhydride

Sodium chromate(VI) anhydrous

Potassium hydrogen carbonate

8-Hydroxyquinoline

Borax buffer solution

Maleic acid

Barium stearate

Sodium benzoate

Ethylenedinitrilotetraacetic acid

Sodium carbonate anhydrous

Semicarbazide hydrochloride

Sodium hexametaphosphate

Iron(II) chloride tetrahydrate

4,4'-Diaminodiphenyl sulphone

Citric acid monohydrate

N,N'-Methylene bisacrylamide

Potassium hydroxide

Hydrochloric acid 32%

Span 60

Bismuth(III) chloride

Naphthalene

Bismarck brown Y (C.I.21000)

Sodium ethylate

Tris(hydroxymethyl) aminomethane

Copper powder

Sodium nitrate

Nitroblue tetrazolium chloride

Indigo carmine (C.I.73015)

Manganese powder

Acetylacetone

D-Phenylalanine

Ethylenediamine tetraacetic acid tetrasodium salt dihydrate

Sodium hypophosphite monohydrate

Ethylene glycol monobutyl ether

1-Dodecanol

Ammonium pyrrolidine dithiocarbamate

Ethylenediamine tetraacetic acid dipotassium salt dihydrate

Sodium iodate

1,4-Benzoquinone

Boron trifluoride etherate

Calcein indicator

Acid chrome blue K (C.I.16675)

3,5-dihydroxytoluene

Selenium dioxide

Ammonium iodide

Sodium iodide dihydrate

Ethanol 70%

1-Methyl-2-pyrrolidone

Methyl red indicator solution for use in test methods

Sudan I (C.I.12055)

Lithium standard solution for impurity

Sulfur sublimed

Starch soluble

Guanidine carbonate

2,4,6 - Triamino-1,3,5-triazine

Petroleum ether 60-90

Ethanol 75%

Sodium hydrogen tartrate

Silica gel

Potassium sulfate

Iodoethane

Sodium sulfate anhydrous

Ammonium iron(II) sulfate hexahydrate

Nicotinamide adenine dinucleotide free acid

Trimethylol propane

Sodium sulfide nonahydrate

Polyethylene glycol 8000

Sodium carboxymethyl cellulose

SodiuM cholate hydrate

Lead(Ⅱ) acetate basic

Potassium oxalate monohydrate

OP emulsifying agent

Sodium hydroxide solution 30%

Gentian violet (C.I.42535 or 42555)

Malachite green (C.I.42000）

Iron(III) nitrate nonahydrate

Iodine

Sodium diphenylamine-4-sulfonate

Rose bengal sodium salt (C.I. 45440)

Casein

Aluminum hydroxide

Isobuty methyl ketone

Barium acetate

Sodium chlorate

Hydrochloric acid 35%

Bis(cyclohexanone)- oxalyldihydrazone

Potassium fluoride dihydrate

Quartz sand

Sodium ferrocyanide

Tetrabutylammonium iodide

Calcium hydroxide

Ethanol 75%

α-Naphthylacetic acid

Hydroquinone

Benzidine dihydrochloride

Ammonium tartrate

Silicone oil H201-500

Benzoic acid

Phosphorus acid

Iron standard solution for impurity

Aluminum chloride crystal

Calcium stearate

1H-Benzotriazole

di-Magnesium trisilicate

Ammonium aluminum sulfate dodecahydrate

Bromothymol blue

Magnesium carbonate basic pentahydrate

Chromium(III) sulfate solution 50%

Bromocresol green solution 0.4%

Indole-3-butyric acid

Copper(II) hydroxide

Gold chloride / Chloroauric acid hydrated

Aluminum nitrate nonahydrate

2-hydroxy-3,5-dinitro-Benzoic acid

Diethyl ether

Periodic acid

Potassium hydroxide 45%

Diethylene glycol monomethyl ether

Peptone

Diacetyl monoxime

Sodium dodecylsulfonate

N,N-Dimethylbenzylamine

DL-Alanine

Ammonium cerium(IV) sulfate

Magnesium chloride hexahydrate

Silicotungstic acid

Sodium sulfate decahydrate

Iodine standard volumetic solution

Iron(III) citrate pentahydrate

Polyethylene glycol 10000

Copper standard solution for impurity

Ammonium hydrogen difluoride

Chromium powder

Glycerol

tert-Butylamine

Sodium tungstate dihydrate

Nickel(II) chloride hexahydrate

Ethanol absolute 99.98%

Diacetone alcohol

1,1,2,2-Tetrachloroethane

Pyridine

Stannous methanesulfonate

Cinchonine

Copper(II) nitrate trihydrate

Barium hydroxide octahydrate

β- Cyclodextrin

Ammonium acetate

Zinc nitrate hexahydrate

N,N'-Methylene bisacrylamide

iso-Butanol

Hydroxylamine sulfate

Polyethylene glycol 6000

Lead(Ⅱ) oxide yellow

Cyclohexanol

Sodium carboxymethyl cellulose 300-800

4,4'-Diaminodiphenylmethane

Alizarin complexone

Sodium dodecylbenzenesulfonate

Sodium diethyldithiocarbamate trihydrate

Selenite Cystine broth

Zinc dihydrogen phosphate

Zinc sulfate heptahydrate

Carbon tetrachloride

Bromocresol green

Aluminum sulfate octadecahydrate

Lanthanum chloride heptahydrate

Barium nitrate

Lead powder

D-Sorbitol

N,N-Dimethylformamide

Sodium 1-pentanesulfonate

Potassium acetate

Potassium hydrogen phthalate

iso-Octane

Potassium chromate indicator solution.

Benzaldehyde

Sodium fluoroaluminate

Sodium hydrogen carbonate

n-Octane

Benzyl alcohol

2-Mercaptobenzothiazole

Lithium carbonate

Aluminum oxide neutral 200-300

Ethylamine water solution

Lead(II) nitrate standard volumetic solution

Bromocresol purple

Cobalt(II) nitrate hexahydrate

Copper(II) chloride dihydrate

Sudan III (C.I.26100)

Sodium hydroxide standard volumetic solution

Calcium dihydrogen phosphate

DL-Malic acid

Antipyrine

Potassium hexachloroplatinate(Ⅳ)

Tween 60

N-Bromosuccinimide

2,4-Dinitrophenylhydrazine

Sodium carboxymethyl cellulose 800-1200

di-Potassium hydrogen phosphate trihydrate

Disodium hydrogen phosphate dodecahydrate

sec-octyl alcohol

Ethylene glycol phenyl ether

Metol

Barium oxide anhydrous

Copper(II) oxalate hemihydrate

Copper(II) acetate monohydrate

Potassium bromate

Histamine phosphate

Phenol red solution 0.02%（AR)

Sodium dihydrogen phosphate monohydrate

Potassium chlorate

1,5-Diphenylcarbazide

Ethanol 73%～75%

Methyl salicylate

Lithium chloride monohydrate

Selenium powder

Potassium tartrate hemihydrate

Sodium thiosulfate pentahydrate

Neutral red (C.I.50040)

Sodium hypochlorite

Thioglycollate medium

Cupferron

Cobalt(II) acetate tetrahydrate

Methylene blue (C.I.52015)

Ethanolamine 10%

Citric acid

Eosin Y (water soluble) (C.I.45380)

Sodium perchlorate monohydrate

Charcoal activated powder

Tin granular

Aluminum oxide neutral

N-Phenylanthranilic acid

1-Amino-2-naphthol-4-sulfonic acid

Guanidinium chloride

Hydrobromic acid

Sodium hydroxide solution 40%

Bismuth subnitrate

Lanthanum nitrate hexahydrate

Sodium dihydrogen phosphate dihydrate

Hydrochloric acid standard volumetic solution

Itaconic acid

Carmine

Tin(IV) chloride pentahydrate

Nickel(III) oxide

1,4-Phenylenediammonium dichloride

L-Cystine

Triphenylphosphine

Sodium chromate tetrahydrate

Aniline blue (water soluble) (C.I.42755)

Vanillin

Chrome azurol S (C.I.43825)

Methylamine water solution

Potassium pyrosulfate

Folic acid

Iodine monochloride

Magnesium sulfate heptahydrate

Polyethylene glycol 4000

Sulfuric acid standard volumetic solution

2-Butanol

Glycerol monostearate

Potassium permangaNot availablete standard volumetic solution

p-Toluene sulfonamide

Chromium(III) nitrate nonahydrate

Polyethylene glycol 1450

Lithium hydroxide monohydrate

Hydrochloric acid 31%

Bismuth(III) oxide

Formaldehyde solution

Copper(II) carbonate basic

2,3,5-Triphenyl tetrazolium chloride

Trisodium phosphate dodecahydrate

Bile salt pig

Sodium sulfite anhydrous

Polyethylene glycol 400

Chromium(III) sulfate hexahydrate

Cedar wood oil

Potassium dihydrogen phosphate

1-Bromopropane

iso-Butyl acetate

2-Butyne-1,4-diol

Nigrosine (water soluble)

Murexide

Cinnamic acid

Congo red (C.I. 22120)

Potassium pyrophosphate trihydrate

Paraffin liquid

Potassium oleate

Aluminum acetylacetonate

4-Hydroxybenzaldehyde

Hydroxylammonium chloride

iso-Propanol

Glycylglycine

Eriochrome black T (C.I.14645)

Ethyl 4-hydroxybenzoate

1,2-Propanediol

Potassium perchlorate

Bromocresol green sodium salt

Mandelic acid

Crystal violet (C.I.42555)

Ammonium dihydrogen phosphate

Nickel(II) nitrate hexahydrate

Ethylene glycol monomethyl ether

Diethylene glycol monoethyl ether

Potassium standard solution for impurity

Sodium potassium tartrate tetrahydrate

Diethyl ether anhydrous

Iron(III) oxide

Silicic acid

Potassium thiosulfate hydrate

Acrylic acid

Polyethylene glycol 1000

Potassium metabisulfite

Sodium hydroxide solution 49%

Oxalic acid

Phosphorous acid

Chromium(Ⅲ) potassium sulfate dodecahydrate

2,4-Dinitrophenol

Potassium stannate

Sodium fluorosilicate

1,3,5-Trimethylbenzene

Polyethylene glycol 300

Iron(III) sulfate

1,2-Phenylenediamine

Diboron trioxide

Sodium dichromate dihydrate

Palladium(II) chloride anhydrous

Ethylenediamine tetraacetic acid standard solution

D-Glucose monohydrate

Diammonium hydrogen citrate

Methyl red sodium salt

Methane sulfonic acid

Potassium antimony tartrate

Chloral hydrate

Ammonium cerium(IV) nitrate

Sodium standard solution for impurity

Benzophenone

Hydrogen peroxide 30%

Amberlite 732

Thiamine chloride hydrochloride

Sodium silicate nonahydrate

Charcoal activated granular

Zirconium oxychloride octahydrate

Ethylenediaminetetraacetic acid ferric monosodium salt

Fluosilicic acid 23%-25%

Sodium hydroxide solution 32%

p-Xylene

Benzidine

Ammonium iron(III) sulfate dodecahydrate

Magnesium turnings

Sodium hydrogen fluoride

Potassium permanganate

Zirconium nitrate

Magnesium ribbon 99.5%

2-Nitrophenol

Cerium(IV) sulfate tetrahydrate

Dicyclohexyl phthalate

Alizarin yellow R (C.I.14030)

1-Cyanoguanidine

Sodium tetraborate decahydrate

Manganese nitrate solution 50%

1-(2-Pyridylazo)-2-naphthol

Calcium fluoride

4-Aminoantipyrine

Butyl methacrylate

4-Chlorophenoxy acetic acid

Ammonium cerium(IV) sulfate standard volumetic solution

Potassium hydrogen sulfate

Sodium tartrate dihydrate

Benzenemethanaminium

Nitric acid 40%

Sodium metaborate hydrate

4-Nitrobenzoic acid

Acrylamide

Sodium 1-octanesulfonate

Benzene

Cyclohexylamine

Orange II

Silicone oil H201-100

D-Glucose

Zinc free from arsenic

Dimethylglyoxime

Triethylenetetramine

Lithium sulfate monohydrate

Pyrogallol acid

Magnesium ribbon

Sodium heparin

Phenol red sodium salt

Potassium hexacyanoferrate(Ⅱ) trihydrate

Sodium ammonium hydrogen phosphate

Phenolphthalein

Methyl red (C.I. 13020)

Triethylene glycol

Triethyl phosphate

Salicylamide

Diammonium hydrogen phosphate

Potassium hexacyanoferrate(Ⅲ)

Nickel(II) acetate

Nitroso R salt

di-Potassium hydrogen phosphate anhydrous

1,4-Dioxane

Lymphocyte separation media

Fluorescein sodium

Manganese standard solution for impurity

Triethyl orthoformate

Sodium barbital