2946 Results for: "MACHEREY-NAGEL"

Supplier: MACHEREY-NAGEL

NUCLEOSIL® C18 AB is a specially crosslinked octadecyl modified silica phase for HPLC.

Supplier: MACHEREY-NAGEL

Reagents for the determination of cyanide in water samples.

Supplier: MACHEREY-NAGEL

CHROMABOND® OH is a diol modified silica phase for SPE.

Supplier: MACHEREY-NAGEL

CHROMABOND® CN is a cyanopropyl modified silica phase for solid phase extraction.

Supplier: MACHEREY-NAGEL

These test mixtures are used for controlling the performance of fused silica capillary columns and the GC system.

Supplier: MACHEREY-NAGEL

Filter aids transform difficult precipitates and colloidal particles into a form which can be easily filtered. When slimy and strongly lyophilic, swelling precipitates are involved, the fibres of the filter flocs prevent formation of a continuous, impermeable layer on the filter. The resulting filter cake remains porous and permeable, and clogging of the filter is prevented.

Supplier: MACHEREY-NAGEL

Silyl-271 will derivatise all hydroxyl groups in any position. Useful in multiderivatisation schemes involving hydroxyl or amine groups.

Supplier: MACHEREY-NAGEL

Silylation reagent with recommended applications: carboxylic acids, alcohols, phenols, primary and secondary amines and amino acids.

Supplier: MACHEREY-NAGEL

Methylation with DMF-DMA can be applied for fatty acids, primary amines and partially amino acids forming N-dimethyl-aminomethylene amino acid methyl esters. DMF-DMA is a poor solvent, for this reason it is necessary to use a mixture of DMF-DMA with pyridine, THF, acetone (barbiturates) or another solvent.

Supplier: MACHEREY-NAGEL

Acylation with fluorinated bisacylamides is recommended for alcohols, primary and secondary amines as well as for thiols under mild, neutral conditions.

Supplier: MACHEREY-NAGEL

Photometric test kit for the determination of phenols in water samples.

Supplier: MACHEREY-NAGEL

The activated charcoal filter paper MN 728 is particularly suited for the clarification and decolouring of solutions. The activated charcoal is incorporated in the paper and cannot be washed out into the filtrate.

Supplier: MACHEREY-NAGEL

MN 85/220 is a thick glass fiber paper with high basis weight for the filtration of large volumes of liquids.

Supplier: MACHEREY-NAGEL

Embossed filter papers particularly suited for general laboratory applications.

Supplier: MACHEREY-NAGEL

Quartz fibre filters feature an extremely low content of metal traces recommended for the analysis of air-borne particles.

Supplier: MACHEREY-NAGEL

Paper chromatography is the chromatographic technique separation due to partition of the analytes between special paper grades and the mobile phase, which penetrates the paper by capillary action ascending, descending and circular techniques are possible.

Supplier: MACHEREY-NAGEL

This test paper allows the quick and easy detection of free halogens (Chlorine, Bromine, Iodine). Free nitrous acid HNO₂ (not nitrite ions) interferes, but can be destroyed by addition of amidosulphuric acid.

Supplier: MACHEREY-NAGEL

HMDS is weak TMS donor. If used as sole reagent, it is slow and not very effective. After addition of catalytic quantities (e.g., 1 %) of TMCS or as a mixture with TMCS it is a fast and quantitative reagent for trimethylsilylation of organic compounds.

Supplier: MACHEREY-NAGEL

These papers are made hydrophobic (impermeable to water) by impregnation with a silicone. With the aid of these filters, water can be separated from water-immiscible organic solvents in an elegant manner, by means of a simple filtration.

Supplier: MACHEREY-NAGEL

Semi-quantitative test strips for reliable determination of iron concentrations as low as 0.05 mg/L (ppm). A hole in the plastic carrier allows the water to migrate through the test pad increasing the sensitivity by a factor of nearly 10. Ideal for rapid and easy analysis of iron directly on-site. No maintenance or calibration is required.

Supplier: MACHEREY-NAGEL

Nonpolar silarylene GC phase with low bleeding.

Supplier: MACHEREY-NAGEL

NUCLEODUR® Sphinx RP is a bifunctional RP phase with a balanced ratio of propylphenyl and C18 ligands, using in HPLC.

Supplier: MACHEREY-NAGEL

NUCLEODUR® HILIC is an ammonium – sulfonic acid modified silica phase for HPLC.

Supplier: MACHEREY-NAGEL

NUCLEODUR® C18 PolarTec is an octadecyl modified silica phase with embedded polar group for HPLC.

Supplier: MACHEREY-NAGEL

NUCLEODUR® SiOH is an unmodified silica phase for HPLC.

Supplier: MACHEREY-NAGEL

NUCLEODUR® C18 Gravity-SB is a monomeric octadecyl modified silica phase with extensive endcapping for HPLC.

Supplier: MACHEREY-NAGEL

Semi-quantitative test strips for the determination of nitrite and pH. Ideal for rapid and easy analysis of nitrite and pH directly on-site. No maintenance or calibration is required.

Supplier: MACHEREY-NAGEL

Semi-quantitative test strips for reliable determination of copper concentrations as low as 0.1 mg/L (ppm). A hole in the plastic carrier allows the water to migrate through the test pad increasing the sensitivity significantly. Ideal for rapid and easy analysis of copper directly on-site. No maintenance or calibration is required.

Supplier: MACHEREY-NAGEL

CHROMABOND® HR-XCW is a weak carboxylic acid modified polymeric cation exchanger for SPE.

Supplier: MACHEREY-NAGEL

Septa, Silicone white/PTFE blue, Hardness: 45° shore A, Thickness: 1,5 mm