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Sodium dichromate dihydrateCOA Report

CAS No.：7789-12-0
Molecular weight：297.99
Molecular formula：Na₂Cr₂O₇·2H₂O
UN Code：3086
EC No.：234-190-3
HS-No：28413000

Information

Specification category：

Product No.	Product name	specifications
1.01416.015	Sodium dichromate dihydrate	AR500g
1.01416.025	Sodium dichromate dihydrate	CP500g
1.01416.035	Sodium dichromate dihydrate	AR25kg/drum
1.01416.075	Sodium dichromate dihydrate	AR2.5kg/Sack
1.01416.085	Sodium dichromate dihydrate	Spec25kg/drum
1.01416.085	Sodium dichromate dihydrate	Spec25kg/drum

Characteristic： Appearance and properties: nacarat crystal,deliquescent.
Relative density (water=1): 2.35
Melting point(℃): 357(no water)
Boiling point(℃): 400(no water)
Concentration: assay: technical grade firstclass, secondary≥98.0%.
Solubility: Soluble in water,Dissolved in ethanol.
Technical indicators：

Item	AR	CP
Assay(Na2Cr2O7•2H2O)	≥99.5%	≥99.0%
Insoluble matter in water	≤0.003%	≤0.01%
Chloride(Cl)	≤0.005%	≤0.02%
Sulfate(SO4)	≤0.02%	≤0.05%
Aluminum(Al)	≤0.002%	≤0.005%
Calcium(Ca)	≤0.005%	≤0.02%
Iron(Fe)	≤0.0005%	≤0.001%

Hazard characteristics：

IATA-DGR UN 3086 TOXIC SOLID,OXIDIZING,N,O,S(SODIUM DICHROMATE),6,1(5.1),II

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Cetyltrimethylammonium bromide

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Petroleum ether 30-60

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DL-Aspartic acid

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alpha-Cyclodextrin

Tetraethylene pentamine

Chloroacetic acid

Calcium hydrogen phosphate dihydrate

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Aluminum potassium sulfate dodecahydrate

p-Toluenesulfonyl chloride

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Methyl orange (C.I.13025)

Ammonium benzoate

Sodium formate anhydrous

Potassium fluosilicate

Aluminum powder 100-200

Potassium fluoborate

Manganese(II) carbonate

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Octadecanoic acid

Tetrachloroethylene

Alizarin red (C.I.58005)

tetra-Sodium diphosphate decahydrate

Polyethylene glycol 6000

Methyl methacrylate

Sodium hydrogen sulfate monohydrate

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Potassium chromate

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Chloroplatinic acid

Eriochrome blue black R (C.I.15705)

Niobium pentaoxide

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Hydrochloric acid 24-26%

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Pararosaniline chloride

Merthiolate sodium

Sodium malonate

Copper(I) oxide

Ethylenediamine tetraacetic acid tetrasodium salt anhydros

Hydrazinium hydroxide 35%

Potassium carbonate crystal

Lead(Ⅱ) carbonate basic

Sodium salicylate

Aluminum powder

Ethylenediammonium dichloride

Diisopropylamine

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

Barium chloride dihydrate

Indium granular

Diethylene glycol monobutyl ether

2-Thiobarbituric acid

Hydrazinium hydroxide 55%

Molybdenum disulfide

Phenylhydrazine

Nitric acid 69-71%

N,N-Dimethylaniline

Nickel(II) sulfate hexahydrate

Martin medium modified

Kligler iron agar

Nickel(II) carbonate basic tetrahydrate

Potassium thiocyanate

Potassium bromide

Formaldehyde solution 28%

iso-Propanol 99.9%

Polyethylene glycol 600

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

Potassium peroxodisulfate

Cobalt(III) oxide

Copper(II) oxide wire

Tetraethylammonium bromide

Lead(Ⅱ) sulfate

Potassium iodate

1-Dodecanethiol

Magnesium sulfate anhydrous

Manganese(II) acetate tetrahydrate

Dimethyl sulfoxide

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

Polyethylene glycol 2000

Dodecanoic acid；Lauric acid

Cerium(III) nitrate hexahydrate

Benzyl chloride

Nitrilotriacetic acid

Calcium carbonate

Copper(II) sulfate pentahydrate

Benzoyl hydrazine

Sodium thiosulfate standard volumetic solution

Sodium acetate trihydrate

Diethylene glycol

Graphite powder

Polyethylene-polyamines

Ethylenediaminetetraacetic acid magnesium disodium salt

5% Benzalkonium bromide solution

Trimethylammonium

Hydrazinium hydroxide 50%

1-Bromonaphthalene

Bismuth citrate

Sodium benzenesulfinate

Choline chloride

Sodium m-nitrobenzenesulfonate

Phosphotungstic acid

Sodium hydrogen phthalate

Dibutyl o-phthalate

4-Methylpyridine

Ethylene glycol 30%

Copper(II) sulfate anhydrous

Strontium chloride hexahydrate

Methylammonium chloride

2-Aminothiazole

Bismuth granular

Sodium nitroferricyanide dihydrate

Trimethylchlorosilane

Zinc phosphate tetrahydrate

Calcium nitrate

Manganese(II) chloride tetrahydrate

Sodium hydrogen sulfite

Sodium perborate tetrahydrate

Potassium dichromate standard volumetic solution

Sodium sulfosalicylate

Chloramine T trihydrate

Nickel(II) sulfamate solution

Phosphorus(V) oxide

Aluminum chloride anhydrous

Lead(Ⅱ) acetate trihydrate

Sodium 1-hexanesulfonate

N,N-Dimethylacetamide

Potassium tetraoxalate dihydrate

Ammonium phosphate

Peroxyacetic acid

Hydrazinium hydroxide 80%

Polyvinyl alcohol ammonium phosphate

Safranine T (C.I.50240)

3,3'-Dimethyldiphenylamine

Ammonium metavanadate

Indole-3-acetic acid

Sodium cobaltinitrite

Calcon carboxylic acid

Ammonium persulfate

Ethylenediamine tetraacetic acid dipotassium salt hexadrate

Lead(Ⅱ) chromate

Iron(III) chloride hexahydrate

Lead(Ⅱ) carbonate

Cellulase Onozuka R-10

Tetramethylammonium hydroxide

m-Chloroaniline

Lithium acetate dihydrate

Potassium sodium citrate monohydrate

o-Cresolphtalein complexon

6-Amino caproic acid

Hydrogen peroxide 50%

Copper(I) iodide

Dimethyl yellow (C.I.11020)

Maltose monohydrate

Strontium nitrate

Semixylenol orange

Ethanol absolute

Acetic acid glacial

Magnesium citrate tetradecahydrate

Polyethylene glycol 20000

Sodium tripolyphosphate / Sodium triphosphate

Ammonium molybdate tetrahydrate

Diisopropyl ether

Tin(II) chloride dihydrate

1,2-Dibromoethane

N-Methylmorpholine

Hydrochloric acid 18%

Sodium succinate hexahydrate

Glutaraldehyde 25%

Ethylenediamine tetraacetic acid tetrasodium solution

Formaldehyde solution 30%

Thiosemicarbazide

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

Aluminum chloride basic solution 50%

Titanium trichloride solution

Potassium hydrogen tartrate

Fluosilicic acid

Nigrosine ( spirit soluble)

Methyl blue (C.I.42780)

Ethylenediamine tetraacetic acid disodium salt standard volumetic solution

Benzoyl chloride

Disodium hydrogen phosphate anhydrous

Cadmium sulfate octahydrate

Iron(II) sulfate heptahydrate

Ethylene glycol dimethyl ether

calcium phosphate

Dichloromethane

Titanium dioxide

Ethylenediamine

Polyethylene glycol 200

Hydrochloric acid

Ponceau S (C.I. 27195)

Barium carbonate

Sodium dodecylsulfate

Petroleum ether 90-120

tert-Butyl methyl ether

Sodium D-gluconate

1,2,3,4-Tetrahydronaphthalene

Iron standard solution for impurity

Sodium chloride

Sodium acetate anhydrous

Ammonium thiocyanate

Sulfuric acid 50%

Sodium borohydride

Trichloroethylene

Hydrofluoric acid

Acetic acid 36%

Ethyl acetoacetate

Zinc standard solution for impurity

Ethylenediamine tetraacetic acid disodium salt

Indigo carmine (C.I. 73015)

Cupric Pyrophosphate

Iron(II) sulfide

Bromophenol blue

Potassium hydroxide 48%

tri-Potassium phosphate trihydrate

Silver diethyldithiocarbamate

Cerium(IV) oxide

Alikali blue 6B (C.I.46725)

L-Cysteine hydrochloride anhydrous

Barium chromate

L-Histidine hydrochloride

Sodium tetraphenyl boron

Hydrochloric acid 33%

Trifluoroacetic acid

Polyphosphoric acid

Methyl 4-hydroxybenzoate

Titan yellow (C.I.19540)

Sodium periodate

Molybdenum trioxide

Cobalt(II) sulfate heptahydrate

1,10-Phenanthroline

Sodium hexametaphosphate

Sodium hydroxide solution 50%

Potassium dichromate

Methyl violet (C.I.42535) Crystal Violet

Zirconium hydroxide

Hydrogen peroxide 35%

Ammonium bromide

Peroxyacetic acid

Dimethyl o-phthalate

Nickel ammonium sulfate hexahydrate

Sodium stannate trihydrate

Sodium thiocyanate

4-(Dimethylamino)benzaldehyde

Tetrabutyl titanate

Propyl 4-hydroxybenzoate

Polyvinyl alcohol

Sodium hydroxide

Lanthanum oxide

Hydrochloric acid 20%

1,2-Propanediol

0.5% Dextrose broth

Chromotropic acid disodium salt

Hexamethyldisilazane

Trisodium citrate dihydrate

Manganese(II) sulfate monohydrate

Tetrahydrofuran

Strontium carbonate

Tin(II) chloride

Ammonium chloride

Potassium periodate

Tetrahydrofurfuryl alcohol

Benzenesulfonyl chloride

Lead standard solution for impurity

Peroxyacetic acid

Sodium fluoride

Potassium iodate standard volumetic solution

Sodium dihydrogen phosphate anhydrous

Silicon dioxide

Methylthymol blue

Potassium phosphate tribasic anhdrous

Sulfuric acid standard solution 0.1%

Potassium hydrogen oxalate

Peptone, fish powder

Ammonium sulfamate

Magnesium nitrate hexahydrate

Lead(Ⅱ) chloride

Formaldehyde solution 22.8%

Amido black 10B

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

5-(4-Dimethylaminobenzylidene)-rhodanine

Na-Benzoyl-L-arginine ethyl ester hydrochloride

5-Sulfosalicylic acid dihydrate

1,2-Dichlomoethane

Calcium chloride anhydrous

Hexamethylenetetramine

Barium peroxide

Methylamine alcohol solution

Polyvinyl alcohol

Copper(II) formate hydrate

1-Naphthylamine

Lead(Ⅱ,Ⅳ) oxide red

tri-Potassium citrate monohydrate

Calcium chloride dihydrate

N-Ethylmaleimide

Potassium nitrate

Nitric acid fuming

Manganese dioxide

Lactose bile fermentation medium

Zinc acetate dihydrate

Dimethylamine water solution

Phthalic anhydride

Sodium chromate(VI) anhydrous

Potassium hydrogen carbonate

8-Hydroxyquinoline

Borax buffer solution

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%

Bismuth(III) chloride

Bismarck brown Y (C.I.21000)

Sodium ethylate

Tris(hydroxymethyl) aminomethane

Nitroblue tetrazolium chloride

Diisobutylamine

Disodium rhodizonate

Indigo carmine (C.I.73015)

Manganese powder

D-Phenylalanine

Ethylenediamine tetraacetic acid tetrasodium salt dihydrate

L-Ascorbic acid

Sudan IV (C.I.26015)

Magnesium hydroxide

Sodium hypophosphite monohydrate

Ethylene glycol monobutyl ether

Ammonium pyrrolidine dithiocarbamate

Ethylenediamine tetraacetic acid dipotassium salt dihydrate

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

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

Guanidine carbonate

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

Triammonium citrate

Magnesium stearate

Triethanolamine

Dibutyltin dilaurate

Petroleum ether 60-90

Sodium hydrogen tartrate

Potassium sulfate

Sodium sulfate anhydrous

Ammonium iron(II) sulfate hexahydrate

Nicotinamide adenine dinucleotide free acid

Trimethylol propane

Sodium sulfide nonahydrate

Polyethylene glycol 8000

Sodium carboxymethyl cellulose

Germanium oxide

2-Chlorobenzoic acid

Hexachloroethane

Diantipyryl methane

Brilliant Green

Trichloroacetic acid

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

Sodium diphenylamine-4-sulfonate

Rose bengal sodium salt (C.I. 45440)

Aluminum hydroxide

Isobuty methyl ketone

Sodium chlorate

Hydrochloric acid 35%

Bis(cyclohexanone)- oxalyldihydrazone

Potassium fluoride dihydrate

Sodium ferrocyanide

Tetrabutylammonium iodide

Calcium hydroxide

α-Naphthylacetic acid

Benzidine dihydrochloride

Ammonium tartrate

Silicone oil H201-500

Phosphorus acid

Iron standard solution for impurity

Succinic anhydride

o-Cresolphthalein

Aluminum chloride crystal

Calcium stearate

1H-Benzotriazole

di-Magnesium trisilicate

Tribromomethane

Sulfur precipitated

4-Aminobenzoic acid

Ethyl methyl ketone

Ammonium aluminum sulfate dodecahydrate

Bromothymol blue

Magnesium carbonate basic pentahydrate

Chromium(III) sulfate solution 50%

Diphenylcarbazone

Sodium methylate

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

Potassium hydroxide 45%

Diethylene glycol monomethyl ether

Diacetyl monoxime

Sodium dodecylsulfonate

N,N-Dimethylbenzylamine

Ammonium cerium(IV) sulfate

Magnesium chloride hexahydrate

Silicotungstic acid

Sodium sulfate decahydrate

trans-Cinnamaldehyde

Ammonium carbonate

Iodine standard volumetic solution

Iron(III) citrate pentahydrate

Polyethylene glycol 10000

Copper standard solution for impurity

Ammonium hydrogen difluoride

Chromium powder

tert-Butylamine

Sodium tungstate dihydrate

Nickel(II) chloride hexahydrate

Ethanol absolute 99.98%

Diacetone alcohol

1,1,2,2-Tetrachloroethane

Stannous methanesulfonate

Copper(II) nitrate trihydrate

Barium hydroxide octahydrate

β- Cyclodextrin

Ammonium acetate

Zinc nitrate hexahydrate

N,N'-Methylene bisacrylamide

Hydroxylamine sulfate

Polyethylene glycol 6000

Lead(Ⅱ) oxide yellow

Sodium carboxymethyl cellulose 300-800

4,4'-Diaminodiphenylmethane

Alizarin complexone

Sodium dodecylbenzenesulfonate

Sodium diethyldithiocarbamate trihydrate

Selenite Cystine broth

Zinc dihydrogen phosphate

Glucose anhydrous

Devarda's alloy

Camphor synthetic

Lanolin anhydrous

Hydrazinium sulfate

Zinc sulfate heptahydrate

Carbon tetrachloride

Bromocresol green

Aluminum sulfate octadecahydrate

Ethylene glycol

Lanthanum chloride heptahydrate

N,N-Dimethylformamide

Sodium 1-pentanesulfonate

Potassium acetate

Potassium hydrogen phthalate

Potassium chromate indicator solution.

Sodium fluoroaluminate

Sodium hydrogen carbonate

2-Mercaptobenzothiazole

Lithium carbonate

Aluminum oxide neutral 200-300

Ethylamine water solution

Lead(II) nitrate standard volumetic solution

Bromocresol purple

Cobalt(II) nitrate hexahydrate

Sodium persulfate

Lead(Ⅱ) nitrate

Tin(II) sulfate

Copper(II) chloride dihydrate

Sudan III (C.I.26100)

Sodium hydroxide standard volumetic solution

Calcium dihydrogen phosphate

Potassium hexachloroplatinate(Ⅳ)

N-Bromosuccinimide

2,4-Dinitrophenylhydrazine

Nitric acid 53-55%

Maleic anhydride

Barbituric acid

Sodium carboxymethyl cellulose 800-1200

di-Potassium hydrogen phosphate trihydrate

Disodium hydrogen phosphate dodecahydrate

sec-octyl alcohol

Ethylene glycol phenyl ether

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

iso-Amyl acetate

Strontium sulfate

Ammonium sulfate

Diethyl malonate

Neutral red (C.I.50040)

Sodium hypochlorite

Thioglycollate medium

Cobalt(II) acetate tetrahydrate

Methylene blue (C.I.52015)

Ethanolamine 10%

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

Sodium perchlorate monohydrate

Charcoal activated powder

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

Tin(IV) chloride pentahydrate

Nickel(III) oxide

1,4-Phenylenediammonium dichloride

Triphenylphosphine

Sodium chromate tetrahydrate

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

Chrome azurol S (C.I.43825)

Methylamine water solution

Potassium pyrosulfate

Iodine monochloride

Magnesium sulfate heptahydrate

Polyethylene glycol 4000

Sulfuric acid standard volumetic solution

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

Phthaldialdehyde

2,3,5-Triphenyl tetrazolium chloride

Trisodium phosphate dodecahydrate

Sodium sulfite anhydrous

Polyethylene glycol 400

Chromium(III) sulfate hexahydrate

Potassium dihydrogen phosphate

iso-Butyl acetate

2-Butyne-1,4-diol

Nigrosine (water soluble)

Congo red (C.I. 22120)

Potassium pyrophosphate trihydrate

Paraffin liquid

Potassium oleate

Aluminum acetylacetonate

4-Hydroxybenzaldehyde

Antimony trioxide

Calcium sulfate

Tributyl phosphate

Ammonium dichromate

Sodium pyrosulfite

Hydroxylammonium chloride

Eriochrome black T (C.I.14645)

Ethyl 4-hydroxybenzoate

1,2-Propanediol

Potassium perchlorate

Bromocresol green sodium salt

Crystal violet (C.I.42555)

Alizarin yellow GG

Sodium dithionite

Iodine trichloride

Phosphomolybdic acid

Ammonium dihydrogen phosphate

Nickel(II) nitrate hexahydrate

Ethylene glycol monomethyl ether

Diethylene glycol monoethyl ether

Sulfuric acid 75%

Albumin flake(egg)

Potassium standard solution for impurity

Sodium potassium tartrate tetrahydrate

D(+)-Cellobiose

Perchloric acid

Diethyl ether anhydrous

Iron(III) oxide

Potassium thiosulfate hydrate

Polyethylene glycol 1000

Potassium metabisulfite

Sodium hydroxide solution 49%

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

Hydrogen peroxide 30%

Thiamine chloride hydrochloride

Sodium alginate

Chromium(III) oxide

Magnesium powder 200

Diethyl o-phthalate

mercaptoacetic acid

Sodium silicate nonahydrate

Charcoal activated granular

Zirconium oxychloride octahydrate

Ethylenediaminetetraacetic acid ferric monosodium salt

Fluosilicic acid 23%-25%

Sodium hydroxide solution 32%

Ammonium iron(III) sulfate dodecahydrate

Magnesium turnings

Sodium hydrogen fluoride

Potassium nitrite

Ammonium formate

Diethylenetriamine

Thymolphthalein

Potassium permanganate

Zirconium nitrate

Magnesium ribbon 99.5%

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

Tungsten trioxide

Lithium nitrate

Iron powder reduced

Hydrazium dichloride

Triphenyl phosphite

Sodium tartrate dihydrate

Benzenemethanaminium

Nitric acid 40%

Sodium metaborate hydrate

4-Nitrobenzoic acid

Sodium 1-octanesulfonate

Cyclohexylamine

Silicone oil H201-100

Zinc free from arsenic

Dimethylglyoxime

Triethylenetetramine

Lithium sulfate monohydrate

Pyrogallol acid

Magnesium ribbon

Phenol red sodium salt

Potassium hexacyanoferrate(Ⅱ) trihydrate

Sodium ammonium hydrogen phosphate

Phenolphthalein

Methyl red (C.I. 13020)

Triethylene glycol

Triethyl phosphate

Diammonium hydrogen phosphate

Potassium hexacyanoferrate(Ⅲ)

Nickel(II) acetate

di-Potassium hydrogen phosphate anhydrous

Lymphocyte separation media

Fluorescein sodium

Manganese standard solution for impurity

Triphenyl phosphate

Copper(I) chloride

Thionyl chloride

Ammonium fluoride

Sodium aluminate

Sulfanilic acid

Triethyl orthoformate

Sodium barbital

Copyright © Guangdong Guanghua Sci-Tech Co., Ltd. GuangDong ICP No. 14033791-1