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Europe
Разтворът на метилово червено е азобагрило, което се оцветява в червено, когато pH е под 4,4 (жълто pH < 6,2, оранжево pH 4,4-6,2). Някои бактерии използват глюкоза, за да образуват големи количества киселина, в резултат на което pH стойността на средата спада рязко. Други видове не произвеждат или произвеждат по-малко свободна киселина. Тази разлика може да се визуализира с помощта на метилово червено. Този тест се използва за диференциране на чревни бактерии.
itwreagents
Hydrochloric Acid-Alcohol - Mixture (0.75 % HCl) solution for clinical diagnostics
Specifications: Hydrochloric Acid: 0.75 %
MERCK
Absorption maximum: 461-465
Melting point: 136-141
Identity: confirmed
Europe
Main substance: ≥ 99%
Identity (UV/VIS-spectrum): confirmed test
Melting range: 95 - 99 °C
itwreagents
Minimum assay (Perchl. Ac.): 101,11 %
Identity: IR p/t.
λ of max. ABS in H2O: 413 nm
A 1%, 1 cm, λmax: 1400
T.L.C: p/t.
MAXIMUM LIMIT OF IMPURITIES
Insoluble matter in H2O: p/t.
Water (H2O): 7,64 %
Suitability as complexometric indicator according to ACS: p/t
MERCK
Content DSC (differential scanning calorimetry): ≥ 99.5%
pH transition interval: pH 5.4 - colorless, pH 7.5 - yellow
Macherey-Nagel
AQUADUR test strips are for the quick and easy determination of water hardness. The convenient Dip & Read procedure and the clear color changes from green to red ensure reliable results within seconds. With AQUADUR TH 400, the total hardness in ppm CaCO3 in water can be measured extremely easily by just scanning one test field.
Total hardness - 0 • 25 • 50 • 120 • 250 • 425 ppm CaCO₃
AQUADUR® test strips are for the quick and easy determination of water hardness. The convenient dip & read procedure and the clear colour changes from green to red ensure reliable results within seconds.
below 50 ppm CaCO3– very soft water
50 – 120 ppm CaCO3– soft water
120 – 240 ppm CaCO3 – medium hard water
240 – 360 ppm CaCO3 – hard water
above 360 ppm CaCO3– very hard water
Scale gradation 0, 5, 10, 15, 20, 25 °d*
itwreagents
Identity IR: p/t.
l11 of max. ABS in NaOH 0,1 mol/l: 568 nm
l2 of max. ABS in NaOH 0,1 mol/l: 608 nm
pH transition interval: yellow 5,5, red-violet 6,8
Loss on drying at 135°C: 1.1 %
Insoluble matter in CH3OH: p/t.
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Български