一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

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.

Click on the specific product, view the latest prices of the products, information, serving information
Structure Chemical Name CAS MF
Adsorbent scrapers
		
	Adsorbent scrapers
Preparative TLC plates
		
	Preparative TLC plates
Silica  gel  C18  on  TLC  Plates Silica gel C18 on TLC Plates
Silylation  Sampler  Kit Silylation Sampler Kit
ProteinA,  immobilized  on  polyacrylic  beads,  from  Staphylococcus  aureus ProteinA, immobilized on polyacrylic beads, from Staphylococcus aureus
Liquid  chromatography  column  fittings Liquid chromatography column fittings
Reservoirs  for  LC  columns Reservoirs for LC columns
Magnesium  ionophore  III  -  membrane  A Magnesium ionophore III - membrane A
Universal  indicator  paper,  pH  1,0-11,0 Universal indicator paper, pH 1,0-11,0
Ammonium  ionophore  I  -  membrane  A Ammonium ionophore I - membrane A
Alcohols  with  boron  trifluoride,  derivatizing  agents,  set  for  GC Alcohols with boron trifluoride, derivatizing agents, set for GC
5'-hydroxypiroxicam 5'-hydroxypiroxicam 77459-78-0 C15H13N3O5S
DICYANOCOBYRINIC ACID HEPTAPROPYL ESTER DICYANOCOBYRINIC ACID HEPTAPROPYL ESTER 93441-85-1 C68H101CoN6O14
4-TERT-BUTYL-2,2,14,14-TETRAHOMO-2A,14A, DIOXACALIX[4]ARENE-TETRAACETIC ACID TETRA-TERT-BUTYL ESTER 4-TERT-BUTYL-2,2,14,14-TETRAHOMO-2A,14A, DIOXACALIX[4]ARENE-TETRAACETIC ACID TETRA-TERT-BUTYL ESTER 135463-06-8 C70H100O14
3-AMinopropyl-functionalized silica gel 40-63 MuM, extent of labeling: ~1 MMol/g NH2 loading 3-AMinopropyl-functionalized silica gel 40-63 MuM, extent of labeling: ~1 MMol/g NH2 loading
1,3-Bis[6-(3-benzyl-1-imidazolio)-hexyl]imidazolium trifluoride solution
		
	1,3-Bis[6-(3-benzyl-1-imidazolio)-hexyl]imidazolium trifluoride solution 1245190-26-4 C35H47FN6+2
1,9-Nonanediyl-bis(3-methylimidazolium) difluoride solution
		
	1,9-Nonanediyl-bis(3-methylimidazolium) difluoride solution 1245190-21-9 C17H30F2N4
Block heater (without block), 110V
		
	Block heater (without block), 110V
Bottle-type  sprayer Bottle-type sprayer
FID  Alkyation  Sampler  Kit FID Alkyation Sampler Kit
PTFE  multi-plate  racks PTFE multi-plate racks
Total  ionic  strength  adjustment  buffer  II  solution Total ionic strength adjustment buffer II solution
Multi-element  Ion  Chromatography  Standard  solution  II Multi-element Ion Chromatography Standard solution II
AQUANAL(R)-PLUS CHLORIDE (CL) AQUANAL(R)-PLUS CHLORIDE (CL)
75-77-4 75-77-4 75-77-4
BOEHMER'S SOLUTION BOEHMER'S SOLUTION
CALCIUM IONOPHORE VI CALCIUM IONOPHORE VI 171979-66-1 C100H108O8P4
(S)-NIFE (S)-NIFE 328406-65-1 C19H20N2O7
AQUANAL-PLUS ACCESSORIES AQUANAL-PLUS ACCESSORIES
AQUANAL-PROFESSIONAL AMMONIA NO.2 AQUANAL-PROFESSIONAL AMMONIA NO.2
AQUANAL-PROFESSIONAL SPADNS REAGENT AQUANAL-PROFESSIONAL SPADNS REAGENT
AQUANAL-PROFESSIONAL MANGANESE LR 1 AQUANAL-PROFESSIONAL MANGANESE LR 1
AQUANAL-PROFESSIONAL NICKEL AQUANAL-PROFESSIONAL NICKEL
AQUANAL-PROFESSIONAL VARIO H PHOSPHATE AQUANAL-PROFESSIONAL VARIO H PHOSPHATE
MOLECULAR SIEVE UOP TYPE XL-8 1.3 MOLECULAR SIEVE UOP TYPE XL-8 1.3
CHROMOIONOPHORE II CHROMOIONOPHORE II 136499-31-5 C46H59N3O5
Liquid chromatography columns
		
	Liquid chromatography columns
ZORBAX LP 100/40 C4 ZORBAX LP 100/40 C4 68584-80-5 C10H23ClO2Si2
AQUANAL-PLUS ZINC AQUANAL-PLUS ZINC
Radiello VOC Calibration Kit (Workplace Environment)
		
	Radiello VOC Calibration Kit (Workplace Environment)
Spectroline filter assembly for CX UV-viewing cabinet
		
	Spectroline filter assembly for CX UV-viewing cabinet
Aldrich TLC developing tank - cylindrical
		
	Aldrich TLC developing tank - cylindrical
Spectroline battery-operated UV lamp
		
	Spectroline battery-operated UV lamp
Analtech HPTLC Uniplates: C18-silica gel matrix
		
	Analtech HPTLC Uniplates: C18-silica gel matrix
AQUANAL RH mixed indicator
		
	AQUANAL RH mixed indicator
AQUANAL Fish oxygen
		
	AQUANAL Fish oxygen
AQUANAL-professional Total Nitrogen tube test
		
	AQUANAL-professional Total Nitrogen tube test
AQUANAL-professional Sulfite LR
		
	AQUANAL-professional Sulfite LR
Universal Indicator paper pH 1-11
		
	Universal Indicator paper pH 1-11
AQUANAL-professional Vario H Chlorine Total (DPD)
		
	AQUANAL-professional Vario H Chlorine Total (DPD)
AQUANAL-plus Chloride titrimetric Refill pack
		
	AQUANAL-plus Chloride titrimetric Refill pack
AQUANAL Oekotest Water laboratory low level
		
	AQUANAL Oekotest Water laboratory low level
AQUANAL-professional Vario H Hydrazine
		
	AQUANAL-professional Vario H Hydrazine
AQUANAL(R)-PLUS NITRATE (NO3) AQUANAL(R)-PLUS NITRATE (NO3)
CHLORIDE-SELECTIVE LIQUID ION-EXCHANGER MICROELECTRODE COCKTAIL A CHLORIDE-SELECTIVE LIQUID ION-EXCHANGER MICROELECTRODE COCKTAIL A
Radiello BTEX Calibration Kit (CS2 Desorption)
		
	Radiello BTEX Calibration Kit (CS2 Desorption)
Spectroline E-Series lamp filter
		
	Spectroline E-Series lamp filter
Hamilton TLC syringes
		
	Hamilton TLC syringes
Hirschmann microcapillary pipette
		
	Hirschmann microcapillary pipette
Analtech HPTLC Uniplates: cyano matrix
		
	Analtech HPTLC Uniplates: cyano matrix
Water hardness (total) test sticks Aquadur, 3-21°d
		
	Water hardness (total) test sticks Aquadur, 3-21°d
ChiroSolve Resolving Kit, Complete Acid Series, for solid racemates
		
	ChiroSolve Resolving Kit, Complete Acid Series, for solid racemates
AQUANAL Oekotest pH-value
		
	AQUANAL Oekotest pH-value
AQUANAL-professional DPD No 1 Reagent Solution
		
	AQUANAL-professional DPD No 1 Reagent Solution
AQUANAL-professional Nitrate tube test
		
	AQUANAL-professional Nitrate tube test
Flask adapter for HPLC made of PTFE/FEP (2x1/8 Flask adapter for HPLC made of PTFE/FEP (2x1/8")
AQUANAL-plus gold (Au) 0.1-3.0 mg/L
		
	AQUANAL-plus gold (Au) 0.1-3.0 mg/L
AQUANAL-PLUS HYDRAZINE AQUANAL-PLUS HYDRAZINE
AQUANAL(R)-PLUS CHLORINE (CL2) AQUANAL(R)-PLUS CHLORINE (CL2)
AMMONIUM IONOPHORE I - COCKTAIL B AMMONIUM IONOPHORE I - COCKTAIL B
ETH 500 ETH 500 100581-42-8 C72H116BCl4N
CHLORIDE IONOPHORE I - COCKTAIL A CHLORIDE IONOPHORE I - COCKTAIL A
CHROMOIONOPHORE VII CHROMOIONOPHORE VII 141754-62-3 C45H57N3O5
HYDROGEN CHLORIDE ~1.25 M IN METHANOL, 250 ML HYDROGEN CHLORIDE ~1.25 M IN METHANOL, 250 ML 132228-87-6 CH5ClO
SILYLATING MIXTURE FLUKA II ACC. TO SILYLATING MIXTURE FLUKA II ACC. TO 101660-05-3 C17H42ClN3OSi4
ASCORBIC ACID TEST STICKS QUANTOFIX ASCORBIC ACID TEST STICKS QUANTOFIX
CHLORINE TEST KIT QUANTOFIX CHLORINE TEST KIT QUANTOFIX
CALIBRATOR 4 0 FOR FOS (FOOD-OIL-SENSOR) CALIBRATOR 4 0 FOR FOS (FOOD-OIL-SENSOR)
PH TEST STRIPS PH RANGE 4.5-10.0 PH TEST STRIPS PH RANGE 4.5-10.0
COBALT TEST STICKS QUANTOFIX COBALT TEST STICKS QUANTOFIX
AQUANAL-PROFESSIONAL PHOSPHATE NO.2 LR AQUANAL-PROFESSIONAL PHOSPHATE NO.2 LR
AQUANAL-PROFESSIONAL HYDROGENPEROXIDE LR AQUANAL-PROFESSIONAL HYDROGENPEROXIDE LR
CALCIUM IONOPHORE II - COCKTAIL A CALCIUM IONOPHORE II - COCKTAIL A
TERT-BUTYLCALIX[4]ARENE-TETRAKIS(N,N-DIMETHYLACETAMIDE) TERT-BUTYLCALIX[4]ARENE-TETRAKIS(N,N-DIMETHYLACETAMIDE) 145237-45-2 C60H84N4O8
AQUANAL(R) EDUCASE AQUANAL(R) EDUCASE
GLUCOSE ASSAY REAGENT GLUCOSE ASSAY REAGENT C6H12O6
SulfaMethazine-phenyl-13C6 heMihydrate SulfaMethazine-phenyl-13C6 heMihydrate 1196157-77-3 C24H30N8O5S2
AQUANAL(R)-PLUS TIN AQUANAL(R)-PLUS TIN
Benzylpenicilline-D7 N-ethylpiperidiniuM salt
Penicillin G-D7 salt Benzylpenicilline-D7 N-ethylpiperidiniuM salt Penicillin G-D7 salt 1217445-37-8 C23H33N3O4S
Hydrogen ionophore V
		
	Hydrogen ionophore V 1000849-91-1 C54H74N4O6
Spectroline CX UV-viewing cabinet
		
	Spectroline CX UV-viewing cabinet
Analtech TLC Uniplates: microcrystalline cellulose matrix
		
	Analtech TLC Uniplates: microcrystalline cellulose matrix
AQUANAL Fishwater Lab
		
	AQUANAL Fishwater Lab
AQUANAL reagent for the determination of total hardness
		
	AQUANAL reagent for the determination of total hardness
Nano Silica Gel Adamant on TLC Plates
		
	Nano Silica Gel Adamant on TLC Plates
AQUANAL Oekotest Nitrate
		
	AQUANAL Oekotest Nitrate
AQUANAL-plus Sample Chamber Lid
		
	AQUANAL-plus Sample Chamber Lid
AQUANAL-professional Calibration Standard Fluoride
		
	AQUANAL-professional Calibration Standard Fluoride
Chromosorb Porous Polymer Adsorbent
		
	Chromosorb Porous Polymer Adsorbent
AQUANAL-plus Chloride titrimetric Testkit
		
	AQUANAL-plus Chloride titrimetric Testkit
HomePage | Member Companies | Advertising | Contact us | Previous WebSite | MSDS | CAS Index | CAS DataBase
Copyright © 2016 ChemicalBook All rights reserved.
东兰县| 广元市| 全州县| 博野县| 桃园县| 万安县| 垦利县| 石嘴山市| 安丘市| 天镇县| 铜陵市| 清新县| 天台县| 广德县| 昔阳县| 仙游县| 清流县| 中阳县| 荆门市| 专栏| 托克逊县| 舒城县| 六安市| 淮安市| 邢台县| 齐河县| 长岭县| 望都县| 肇源县| 蛟河市| 建水县| 牡丹江市| 南投县| 广昌县| 乐都县| 舞阳县| 抚州市| 武功县| 泰和县| 祁东县| 金塔县|