Analysis reagents
Analytical reagent is a class of chemical reagents for analytical testing with being able to provide molecules, ions or radicals in the qualitative or quantitative analysis, and the reaction product being precipitated or colored compound or fluorescent substance and so on. Indicator, titrant and Instrument Analytical Reagents also fall into this category. The most important feature of the analysis reagent is the sensitivity and selectivity, even if the number of the test substance is little or the ion concentration is also small, the reagent can also be used for identification or quantitative determination. E.g., when the magnesium ion concentration is 1.2mg / l, addition of disodium hydrogen phosphate and ammonium chloride can cause precipitation. In the analytical chemistry, people must use selective reagents and group reagent. Selective agent is reagents which only react with limited chemical substances. For example, the silver nitrate is the selective precipitation agent for chloride and bromide. Organic selective agent is able to form specific chelate with a metal ion. For example, chromium azure S, 1- (2- pyridine azo) -2-naphthol (PAN), 4- (2- PYRIDYLAZO) - Inter hydroquinone (PAR), under different conditions, can be used as the selective agent on different metal ions.
The group reagent is reagents which can simultaneously separate many ionic agents. Some agents, under certain conditions, no matter whether with or without the presence of other ions, can only have typical reaction with the test material or ions. These reagent reagents are called specific agents. The specificity of the product is determined by the product. The size, charge density and the electronic arrangement of the reagents and reaction ions must meet certain conditions, otherwise it does not react. Most kinds of inorganic analytical reagents have very excellent selectivity; most organic analytical reagents have very excellent special effects. There are many reagents for the analysis of organic functional groups, such as the Bromocresol Green for qualitative and quantitative determination of organic acids, aldehydes, ketones, etc., ninhydrin, phenylhydrazine, 2,4-dinitrophenylhydrazin and semicarbazide.
classification
(1) Reagents for chemical analysis: testing items for the chemical reaction analysis.
1) Baseline reagent: a pure compound for direct formulation of the standard solution and the standard solution in the volumetric calibration.
2) Indicator: reagent used to indicate the end of the titration reagent and can be classified into pH indicator, redox indicator, adsorption indicator, metal indicator and fluorescent indicator, and so on.
(2) Analysis reagent of Instrument: high-purity compounds dedicated to instrumental analysis.
1) Spectroscopically pure reagents: spectroscopically pure compound, often expressed in the SP; reagents for spectral analysis.
2) Chromatography pure reagents: reagents dedicated to analysis by gas chromatography and liquid chromatography analysis.
3) Deuterated reagents: reagents dedicated to the nuclear resonance instrument analysis.
Purification of organic analytical reagents
Organic reagents are widely used in analysis chemistry and are mainly used in solvents, precipitation agents, complexing agents, indicators, reagents and surface active agents, etc. In order to adapt to a variety of analytical demands, sometimes it is required to apply purification process to certain reagents with organic reagent liquid often being purified by distillation while solid matter can be purified through crystallization or sublimation method. Substance having a high vapor pressure, namely organic reagents with low purification boiling point and without decomposition at boiling temperature being commonly applied atmospheric distillation; for substance of less volatile and slightly-soluble in water, namely organic reagents that can be decomposed at high purification boiling point or higher boiling temperature, we can apply vacuum distillation or steam distillation.
Distillation method for purification of organic reagent is commonly purification process in laboratory. Conventional distillation apparatus generally comprises of three parts including a composition distiller, condenser and receiver as well as auxiliary section heater, a thermometer, a wetted tube, cork and so on.
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- Structure:
- Chemical Name:
- SUCROSE ASSAY KIT
- MF:
- C12H22O11
- Chemical Name:
- AQUANAL-PROFESSIONAL MOLYBDATE NO.1
- Chemical Name:
- AQUANAL-PROFESSIONAL VARIO H NITRITE -25
- Chemical Name:
- AMMONIUM IONOPHORE I - COCKTAIL A
- Chemical Name:
- 3-CHLOROPROPYL-FUNCTIONALIZED SILICA GEL
- Chemical Name:
- AMINOPROPYL-CPG-1400 ANGSTROM
- Structure:
- Chemical Name:
- 2-(2-quinolyl)-1H-indene-1,3(2H)-dione
- CAS:
- 83-08-9
- MF:
- C18H11NO2
- Chemical Name:
- AQUANAL(R)-OKOTEST WATER LABORATORY
- Chemical Name:
- MOLECULAR SIEVE DEHYDRATE
- Structure:
- Chemical Name:
- OCTADECYL DERIVATIZED SILICA
- CAS:
- 66369-14-0
- MF:
- C18H37*
- Chemical Name:
- AQUANAL(R)-PLUS CHLORIDE (CL)
- Structure:
- Chemical Name:
- N-Acryloylamido-ethoxyethanol
- CAS:
- 89911-50-2
- MF:
- C7H13NO3
- Structure:
- Chemical Name:
- N-(Ferrocenyl)maleinimide
- CAS:
- 96483-68-0
- MF:
- C14H2FeNO2
- Chemical Name:
- Bottle-type sprayer
- Chemical Name:
- FID Alkyation Sampler Kit
- Chemical Name:
- PTFE multi-plate racks
- Chemical Name:
- Total ionic strength adjustment buffer II solution
- Chemical Name:
- Multi-element Ion Chromatography Standard solution II
- Chemical Name:
- Cellulose fibers on PET- TLC foils
- Chemical Name:
- Silica gel on TLC Al foils
- Chemical Name:
- Comparator cards set
- Chemical Name:
- Multielement Ion Chromatography Standard solution I
- Chemical Name:
- Reference Electrode
- Chemical Name:
- Packing reservoirs for jacketed LC columns
- Chemical Name:
- Glass Plate
- Chemical Name:
- Carbonyl-DNPH Mix 2
- Chemical Name:
- Kjeldahl disintegrating mixture
- Structure:
- Chemical Name:
- 9,11,20,22-Tetrahydrotetrabenzo[d.f,k,m][1,3,8,10]tetraazacyclotetradecine-10,21-dithione
- CAS:
- 221011-41-2
- MF:
- C26H20N4S2
- Chemical Name:
- TLC plate storage racks
- Chemical Name:
- Sigma Pseudo Narcotic Scent Marijuana formulation
- Chemical Name:
- Aldrich rectangular TLC developing tanks, lid only
- Chemical Name:
- TLC saturation pads
- Chemical Name:
- TLC Glass Plates from EMD/Merck KGaA
- Chemical Name:
- AQUANAL Oekotest Ammonium
- Chemical Name:
- AQUANAL -professional Chloride T
- Chemical Name:
- AQUANAL-professional tube test Nitrite
- Chemical Name:
- AQUANAL analytical case for building restoration
- Chemical Name:
- AQUANAL-professional Vario H Iron (Phenantroline)
- Chemical Name:
- AQUANAL -professional Phenol Set
- Structure:
- Chemical Name:
- DI-SODIUM HYDROGEN PHOSPHATE AND POTASSIUM DIHYDROGEN PHOSPHATE
- MF:
- H3KNa2O8P2
- Structure:
- Chemical Name:
- 2-(DODECYLOXY)BENZOTRIFLUORIDE
- CAS:
- 150503-14-3
- MF:
- C19H29F3O
- Chemical Name:
- LEWATIT OC-1950
- Chemical Name:
- AQUANAL-PLUS PEROXIDE
- Chemical Name:
- LEWATIT OC-1800
- Structure:
- Chemical Name:
- 1-DANSYLPIPERAZINE
- CAS:
- 86516-36-1
- MF:
- C16H21N3O2S
- Chemical Name:
- LABORATORY PH-ELECTRODE
- Chemical Name:
- MICROPIPETTES STORAGE JAR
- Chemical Name:
- AQUANAL-PLUS COMPACT LAB
- Chemical Name:
- AQUANAL-PROFESSIONAL ACIDIFYING GP
- Chemical Name:
- AQUANAL-PROFESSIONAL IRON NO. 2 LR
- Chemical Name:
- AQUANAL-PROFESSIONAL SULFIDE NO.1
- Chemical Name:
- AQUANAL-PROFESSIONAL PHOSPHATE NO.1 LR
- Chemical Name:
- MINI VAP 6MV EA
- Chemical Name:
- Glass Magnet
- Chemical Name:
- Ammonium test kit Quantofix
- Chemical Name:
- AQUANAL Fish iron
- Chemical Name:
- LEWATIT MP-62
- CAS:
- 9062-74-2
- Structure:
- Chemical Name:
- ZORBAX LP 100/40 C4
- CAS:
- 93028-55-8
- MF:
- C6H15ClO2Si2
- Chemical Name:
- CONTROLLED PORE GLASS
- Chemical Name:
- AQUANAL(R)-PLUS BASIC CAPACITY
- Structure:
- Chemical Name:
- TRIETHYLAMMONIUM PHOSPHATE
- CAS:
- 10138-93-9
- MF:
- C6H18NO4P
- Chemical Name:
- AQUANAL(R)-PLUS PHOSPHATE (PO4)
- Chemical Name:
- LEWATIT CNP-105
- CAS:
- 56940-15-9
- Chemical Name:
- SODIUM IONOPHORE II - COCKTAIL A
- Structure:
- Chemical Name:
- (2,3-dihydroxy-4-oxo-pentoxy)phosphonic acid
- CAS:
- 190079-18-6
- MF:
- C5H11O7P
- Chemical Name:
- AQUANAL(R)-PLUS CYANIDE/THIOCYANATE
- Chemical Name:
- Developing tank of glass with lid for TLC
- Chemical Name:
- Liquid scintillation vials, glass
- Structure:
- Chemical Name:
- Copper(II) Ionophore V
- CAS:
- 162316-51-0
- MF:
- C16H30O3S4
- Structure:
- Chemical Name:
- hemi-Calcium bis(2-ethylhexyl)phosphate
- CAS:
- 10442-05-4
- MF:
- C16H37CaO4P
- Structure:
- Chemical Name:
- Ytterbium(III) Ionophore II
- CAS:
- 80648-84-6
- MF:
- C18H14N2O3
- Structure:
- Chemical Name:
- Tridodecylamine hydrochloride
- CAS:
- 2486-89-7
- MF:
- C36H76ClN
- Chemical Name:
- Quaternary β-cyclodextrin, 100mg, neat
- Chemical Name:
- Radiello Aldehyde Calibration Standard
- Chemical Name:
- Quantofix test strips
- Chemical Name:
- Spectroline E-Series UV lamp
- Chemical Name:
- Sigma Pseudo Narcotic Scent LSD formulation
- Chemical Name:
- AQUANAL -professional Boron Set
- Chemical Name:
- Hydrogen sulfite ionophore II
- Chemical Name:
- AQUANAL-professional Vario H Copper 1
- Chemical Name:
- Lewatit MP-64 chloride form
- Structure:
- Chemical Name:
- Aluminum oxide on TLC-glass plates
- MF:
- Al2O3
- Structure:
- Chemical Name:
- SULFITE TESTING PAPER
- MF:
- O3S-2
- Chemical Name:
- LEWATIT TP-207
- CAS:
- 57285-14-0
- Structure:
- Chemical Name:
- 5-BUTYL-5-ETHYL-N,N,N',N'-TETRACYCLOHEXYL-3,7-DIOXAAZELAIC DIAMIDE
- CAS:
- 108083-23-4
- MF:
- C37H66N2O4
- Chemical Name:
- AMBERLITE CG-120
- CAS:
- 37360-75-1
- Chemical Name:
- AQUANAL(R)-PLUS NICKEL (NI)
- Chemical Name:
- TOTAL DIETARY FIBER ASSAY KIT
- Chemical Name:
- AQUANAL.- PROFESSIONAL SILICA PR
- Chemical Name:
- SAOB SOLUTION
- Chemical Name:
- GLYCINE BUFFER SOLUTION
- Chemical Name:
- GLUCOSE (GO) ASSAY KIT
- Chemical Name:
- AQUANAL-PROFESSIONAL CHLORINE HR
- Chemical Name:
- AQUANAL-PROFESSIONAL IRON NO. 1-LR
- Chemical Name:
- AQUANAL-PROFESSIONAL SILICA NO.2
- Chemical Name:
- MINI-VAP IMV EA