2269 Results for: "MACHEREY-NAGEL"

Supplier: MACHEREY-NAGEL

NUCLEOSIL® C18 HD is an octadecyl modified silica phase with a high density coverage, using for HPLC.

Supplier: MACHEREY-NAGEL

Polar GC phase.

Supplier: MACHEREY-NAGEL

Vial insert, 0,30 ml, Glass, Clear, Ø×H: 6×40 mm, Conical bottom, Non sterile, Cap included: No

Supplier: MACHEREY-NAGEL

Metal spring for 6×40 mm conical inserts, Metal

Supplier: MACHEREY-NAGEL

Magnifiying lens with scale, 8x

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

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

Supplier: MACHEREY-NAGEL

Photometric test kits for the determination of formaldehyde in water samples.

Supplier: MACHEREY-NAGEL

Polar GC phase.

Supplier: MACHEREY-NAGEL

Cellulose adsorbent for thin-layer chromatography.

Supplier: MACHEREY-NAGEL

Polar GC phase.

Supplier: MACHEREY-NAGEL

Medium polar GC phase.

Supplier: MACHEREY-NAGEL

Photometric test kit for the determination of chlorine dioxide in water samples.

Supplier: MACHEREY-NAGEL

This test paper allows the quick and easy detection of chromate (CrO_⁴^₃-). Cr(III) ions must be converted to Chromate prior to the detection.

Supplier: MACHEREY-NAGEL

CHROMABOND® C2 is a dimethyl modified silica phase for SPE.

Supplier: MACHEREY-NAGEL

CHROMABOND® Na₂SO₄/Florisil® is a combination phase for SPE of hydrocarbons from water.

Supplier: MACHEREY-NAGEL

Embossed filter papers particularly suited for general laboratory applications.

Supplier: MACHEREY-NAGEL

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

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

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

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

Supplier: MACHEREY-NAGEL

CHROMABOND® NH2/C18 is a combination phase for SPE analysis of PAHs from water containing humic acids.

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

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

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

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

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

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.