821 Results for: "GC SOLVENTS"

Supplier: Honeywell Research Chemicals

2-Propanol (Isopropyl alcohol, Isopropanol, IPA) is a colorless solvent and is the simplest example of a secondary alcohol. It is moderately polar and has a boiling point of 82 °C. 2-Propanol dissolves a wide range of non-polar compounds and evaporates quickly. Thus, it is used widely as a cleaning fluid, especially for dissolving oils. Suitable for HPLC , spectrophotometry, GC and residue analysis.

Supplier: Honeywell Research Chemicals

Ethyl Acetate is an organic solvent with the structure CH₃-COO-CH₂-CH₃ (C₄H₈O₂). This colorless liquid has a characteristic sweet odor. In the laboratory, mixtures containing ethyl acetate are used in column chromatography and extractions. Ethyl acetate does not work well as a reaction solvent because it is prone to hydrolysis and transesterification. Ethyl acetate is volatile at room temperature and has a boiling point of 77 °C. Suitable for GC and Pesticide Residue Analysis.

Supplier: TCI America

[Sequencing Solvent] CAS Number: 71-43-2 MDL Number: MFCD00003009 Molecular Formula: C6H6 Molecular Weight: 78.11 Purity/Analysis Method: 99.5% (GC) Form: Clear Liquid Color: Colorless Boiling point (°C): 80 Flash Point (°C): -10 Freezing point (°C): 5 Specific Gravity (20/20): 0.88

Supplier: TCI America

[Sequencing Solvent]
CAS Number: 141-78-6
MDL Number: MFCD00009171
Molecular Formula: C4H8O2
Molecular Weight: 88.11
Purity/Analysis Method: >98.0% (GC)
Form: Clear Liquid
Color: Colorless
Boiling point (°C): 77
Flash Point (°C): -3
Specific Gravity (20/20): 0.90

Supplier: Honeywell Research Chemicals

B&J GC2 Solvents are developed for trace analysis at or below the part-per-billion level, using capillary gas chromatography. Each lot is performance tested to meet demanding GC specifications.

Samples of every B&J GC2 solvent are concentrated 1000-fold and tested by temperature-programmed capillary GC-FID. This analysis detects both low-boiling and high-boiling molecules, anything eluting from toluene through diesel fuel and other semi-volatile compounds of environmental interest.

Features:
Less than 1 ppb trace contamination for semi-volatiles with a molecular weight greater than toluene (92).
Ideal for EPA protocols
Actual lot chromatograms available upon request

Electron capture GC: No residue peaks greater than two ng/L as lindane.

Flame ionization GC: No peaks greater than one ng/mL, having a retention time of greater than diacetone alcohol, on a crossbonded 5% diphenyl/95% dimethyl polysiloxane capillary column for a splitless injection of a 1000-fold sample concentrate after exchange into hexane.

Supplier: TCI America

(stabilized with 2-Methyl-2-butene)
[for HPLC Solvent]
CAS Number: 75-09-2
MDL Number: MFCD00000881
Molecular Formula: CH2Cl2
Molecular Weight: 84.93
Purity/Analysis Method: >99.5% (GC)
Form: Clear Liquid
Boiling point (°C): 39
Melting point (°C): -97
Specific Gravity (20/20): 1.33

Supplier: TCI America

[Sequencing Solvent]
CAS Number: 142-82-5
MDL Number: MFCD00009544
Molecular Formula: C7H16
Molecular Weight: 100.21
Purity/Analysis Method: >99.0% (GC)
Form: Clear Liquid
Color: Colorless
Boiling point (°C): 98
Melting point (°C): -91
Flash Point (°C): -2
Specific Gravity (20/20): 0.68

Supplier: TCI America

[for HPLC Solvent]
CAS Number: 75-05-8
MDL Number: MFCD00001878
Molecular Formula: C2H3N
Molecular Weight: 41.05
Purity/Analysis Method: >99.5% (GC)
Form: Clear Liquid
Boiling point (°C): 82
Melting point (°C): -46
Flash Point (°C): 10
Specific Gravity (20/20): 0.78

Supplier: Adipogen

It is known that phenol and p-cresol are promoters of skin tumors and also urinary excretion of phenol and p-cresol is increased by exposure to benzene, which has hemopoietic toxicity, and toluene, respectively. Therefore, the determination of phenol and p-cresol is important in clinical chemistry and toxicology. Because phenol and p-cresol are present in urine as sulfate or glucuronide conjugates, they are hydrolyzed enzymatically or with acid, followed by distillation or extraction with organic solvent prior to measurement by GC or HPLC. However, these GC and HPLC methods require relatively large sample volumes (more than 1 ml) because of their insufficient sensitivities for measuring small amounts of phenol and p-cresol. The application of fluorescent labeling techniques to HPLC result in a sensitive and selective method. Phthalimidylbenzenesulfonyl chlorides habe also been successfully used for high sensitivity labelling of amino acids prior to HPLC.

Supplier: SPEX CERTIPREP LLC

Consumer Safety Standards
Analytical Standards for Wine

Wine is a complex combination of water, alcohol and other substances such as organic acids, phenols, sugars, carbon dioxide, and sulfur dioxide. The chemical interactions of these compounds, combined with the aging process, determine the quality of the color, taste and aroma of the wine. However, during this process, the chemical interactions can also play key roles in spoiling the wine. For instance, cork taint transpires when naturally occurring airborne fungi are in the presence of chlorophenol compounds to form 2,4,6-trichloranisole (TCA) in the wine. When this occurs, the wine’s aroma is reduced significantly and is replaced by an undesirable smell and taste.

To help regulate the spoilage of wine, the wine industry tests for several compounds that are known to cause this. For this industry, SPEX CertiPrep offers Certified Reference Materials (CRMs) for wine that are designed for GC, GC/MS, HPLC and LC/MS analysis. These standards are manufactured from the highest purity starting materials and the highest grade of solvents available in order to guarantee superior quality. Each standard is supplied with a detailed comprehensive Certificate of Analysis.

Supplier: Adipogen

It is known that phenol and p-cresol are promoters of skin tumors and also urinary excretion of phenol and p-cresol is increased by exposure to benzene, which has hemopoietic toxicity, and toluene, respectively. Therefore, the determination of phenol and p-cresol is important in clinical chemistry and toxicology. Because phenol and p-cresol are present in urine as sulfate or glucuronide conjugates, they are hydrolyzed enzymatically or with acid, followed by distillation or extraction with organic solvent prior to measurement by GC or HPLC. However, these GC and HPLC methods require relatively large sample volumes (more than 1 ml) because of their insufficient sensitivities for measuring small amounts of phenol and p-cresol. In the general, the application of fluorescent labeling techniques to HPLC result in a sensitive and selective method. Some acyl chlorides are known to react with phenolic hydroxy group to form esters. It is known that 4-(N-phthalimidinyl)benzensulfonyl chloride Phisyl-Cl7, having sulfonyl chloride, reacted with phenol to give the corresponding highly fluorescent sulfonyl ester. The sensitivity of Physil-Cl was compared with Dansyl-Cl and DPS-Cl, which are analogous to Physil-Cl as fluorescent labeling reagents having sulfonyl chloride group. The labeling reaction of phenol with Dansyl-Cl and DPS-Cl were carried out according to the method of Ruiter et al.5 and the peaks were detected at the each fluorescence maxima wavelength (Ex350nm a Em550nm for Dansyl-Cl, and Ex320nm a Em386nm for DPS-Cl). Peak height of Phisyl derivative was higher about 85-and 7,3-fold than thosse of Dansyl derivative and DPS derivative, respectively. Among these three reagents, Phisyl-Cl was the most sensitive.

Supplier: VWR International

HMDS deactivated fused silica retention gap / precolumn. Deactivation mainly for apolar solvents.

Supplier: VWR International

General purpose column for solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, allergens, pesticides, and so on.

Supplier: VWR International

CW deactivated fused silica retention gap / precolumn. Deactivation mainly for polar solvents.

Supplier: VWR International

DPTMDS deactivated fused silica retention gap/precolumn. General purpose deactivation for both apolar and polar solvents.

Supplier: VWR International

General purpose low-to-mid-polarity phase for a wide range of applications, including (for example): Residual solvents, volatile pollutants.

Supplier: VWR International

Apolar phase, suitable for high flm thickness columns, to analyze solvents, alcohols, volatiles, and so on.

Supplier: VWR International

Apolar phase, suitable for high flm thickness columns, to analyze solvents, alcohols, volatiles, and so on.

Supplier: VWR International

General purpose column for solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, triglycerides, pesticides, poly-waxes, and so on.

Supplier: VWR International

General purpose column with added temperature stability. For the analysis of solvent impurities, PCBs, hydrocarbons, essential oils, semivolatiles, pesticides, phenols and more.

Supplier: VWR International

Application specifc columns for volatile organic compounds (VOCs), solvents and purgeable compounds. Due to the high max. temperature, they are ideal for two-parallel columns confg. in the same oven. A good alternative to the HI-624 giving different selectivity. It is a more robust than the HI-624 and can operate at higher temperatures.

Supplier: VWR International

General purpose low-to-mid-polarity phase for a wide range of applications, including (for example): Residual solvents, volatile pollutants. HI-624 MS is an MS grade crossbonded column.

Supplier: VWR International

Application specifc columns for volatile organic compounds (VOCs), solvents and purgeable compounds. Due to the high maximum temperature, they are ideal for two-parallel columns confg. in the same oven. A good alternative to the HI-624 giving different selectivity. It is a more robust than the HI-624 and can operate at higher temperatures.

Supplier: AVANTOR PERFORMANCE MATERIAL LLC

Ultra-clean, polypropylene columns with BAKERBOND® HPLC media are engineered to save time, minimize work and final solvent volumes, and improve performance.

Supplier: Restek

General-purpose columns for solvents, Freon® fluorocarbons, alcohols, ketones, silanes, and glycols.

Supplier: Restek

For the analysis of pesticides, PCBs, solvents, and drugs.

Supplier: Restek

Direct injection Uniliner® liners minimize solvent and peak tailing.

Supplier: VWR International

From the exclusive family of high-quality, competitively priced BDH Chemicals — high purity solvents for HPLC applications.

Supplier: AVANTOR PERFORMANCE MATERIAL LLC

BAKER ULTRA RESI-ANALYZED® Reagent—ultra high purity solvents and salts developed for organic residue extraction/concentration procedures. These solvents are fully characterized and lot controlled by ECD, FID, or other method-specific detectors. Advanced stabilizer systems are incorporated to ensure solvent stability and superior performance Solvents are suitable for exacting EPA sample cleanup protocols.

Supplier: Restek

General-purpose columns designed for use with residual solvents, alcohols, oxygenates, and volatile organic compounds.