7478 výsledků pro: "VWR Chemicals"

Supplier: VWR Chemicals

Indicator tablets for determination of water hardness by titration with EDTA.

Specifications
Minimum weight: ≥ 0.20 g
Maximum weight: ≤ 0.23 g
Disintegration time (at 25°C): ≤ 150 s
Application test: conforms

The tablets are dissolved in 100 ml of the water sample to be tested, which has been buffered at pH 10 with 1 ml of Ammonia/ Ammonium chloride buffer solution, and then titrated with EDTA solution (0,01 M) till the sample turns from red to blue.
Total hardness in mg/l = 10×ml of titrant used.

Control samples of  calcium carbonate should be used to calibrate the method.

Supplier: VWR Chemicals

This blue silica gel is used where products need to be protected from humidity during storage and transportation. This silica gel changes its colour from dark blue to pink when saturated.

Supplier: VWR Chemicals

Chlorid vápenatý ≥98.0% (dried basis), powder, AnalaR NORMAPUR® Reag. Ph. Eur.

Supplier: VWR Chemicals

VWR® dehydrated culture media that has been granulated offers both convenience and safety benefits. The correct dissolution of culture media is critical to achieving the best performance. Granulated culture media saves time in the preparation of ready to use culture media. In addition, granulation reduces dust generation, so handling the product is more pleasant and safer for the user, making it a much cleaner and safer working environment.

Supplier: VWR Chemicals

Chlorid barnatý 0.1 mol/l (0.2N) in aqueous solution, AVS TITRINORM volumetric solution

Supplier: VWR Chemicals

Copper di-ammonium EDTA 0.1 mol/l, AVS TITRINORM

Supplier: VWR Chemicals

1-Dekanol ≥99%, GPR RECTAPUR®

Supplier: VWR Chemicals

Jodičnan draselný solution 0.05 M (0.3 N), AVS TITRINORM

Supplier: VWR Chemicals

Hydrogenfosforečnan didraselný trihydrát ≥99.0%, AnalaR NORMAPUR® analytical reagent

Supplier: VWR Chemicals

L(+)-Lithium lactate ≥98.0% (HClO₄), GPR RECTAPUR®

Supplier: VWR Chemicals

SPECTRONORM solvents have extensive specifications to meet the highly demanding requirements of UV applications.

Supplier: VWR Chemicals

Bromkrezolová zeleň ≥95% (dye content), powder, AnalaR NORMAPUR® ACS pH-indicator

Supplier: VWR Chemicals

Refractive index Certified Reference Materials (CRMs) are ideal for verification and calibration of temperature controlled refractometers, with each CRM providing certified values for refractive index measurements at 20, 25 and 30 °C.

Supplier: VWR Chemicals

Dusičnan kobaltnatý hexahydrát 98.0-102.0%, AnalaR NORMAPUR® ACS analytical reagent

Supplier: VWR Chemicals

Bromová voda (nasycený roztok bromu ve vodě) Reag. Ph. Eur. 1012402

Supplier: VWR Chemicals

7 components: 100 mg/l each of Chlorides (Cl-), Fluorides (F-), Sulphates (SO42-), Nitrates (NO3-), Nitrites (NO2-), Bromides (Br-), Phosphates (PO43-) in H₂O

Supplier: VWR Chemicals

Certified reference materials for use as standards for Total Nitrogen, typically used as standards for Kjeldahl nitrogen determination.

Supplier: VWR Chemicals

Tyto nádoby zabrání ztrátám chemikálií vzniklým rozlitím a jsou průhledné, tudíž umožňují kontrolu stavu a obsahu nádoby uvnitř, aniž by bylo nezbytné obal otevírat. Nádoba Safepak je navržená pro použití společně se sklem označeným BDH a láhvemi SafeBreak.
HDPE.

Supplier: VWR Chemicals

thioacetamid ≥99.0% analytical reagent

Supplier: VWR Chemicals

1-Alyl-2-thiomočovina ≥97%, TECHNICAL

Supplier: VWR Chemicals

Ferroin (1,10-phenanthrolineferrous sulphate complex) (7 mg/ml FeSO₄) in aqueous solution, AVS TITRINORM volumetric solution, for COD determination according to NF T 90-101 standard

Supplier: VWR Chemicals

D(+)-Glukóza monohydrát for biochemistry

Supplier: VWR Chemicals

Dihydrogenfosforečnan draselný ≥99.5%, HiPerSolv CHROMANORM® for HPLC

Supplier: VWR Chemicals

Chlorid nikelnatý hexahydrát ≥97%, GPR RECTAPUR®

Supplier: VWR Chemicals

Chlorid draselný 99.0-100.5% USP, Ph. Eur.

Supplier: VWR Chemicals

Uhličitan draselný ≥98%, GPR RECTAPUR®

Supplier: VWR Chemicals

NH₄H₂PO₄ in H₂O.

Supplier: VWR Chemicals

Kyselina citronová monohydrát 99.7-100.5%, AnalaR NORMAPUR® Reag. USP, Reag. Ph. Eur., ACS analytical reagent

Supplier: VWR Chemicals

Chlorid draselný 0.1 mol/l (0.1 N) in aqueous solution Reag. Ph. Eur. 1069101

Supplier: VWR Chemicals

Hexan (směs izomerů), TECHNICAL