Nitrazine Yellow

Synonym(s):2-(2,4-Dinitrophenylazo)-1-hydroxynaphthalene-3,6-disulfonic acid disodium salt;2-(2,4-Dinitrophenylazo)naphthol-3,6-disulfonic acid disodium salt;Nitrazol Yellow

CAS NO.：5423-07-4
Empirical Formula: C16H11N4NaO11S2
Molecular Weight: 522.39
MDL number: MFCD00003938
EINECS: 226-549-8
SAFETY DATA SHEET (SDS)
Update Date: 2025-01-27 09:38:02

What is Nitrazine Yellow?

Chemical properties

bordeaux to brown powder, soluble in water, dilute acid and dilute alkali. The maximum absorption wavelength is 586nm.

The Uses of Nitrazine Yellow

Nitrazine Yellow is a pH-sensitive azo dye. It changes color from yellow to blue in pH range 6.0–7.0 and is widely used in microscopy. Dyes and metabolites.

What are the applications of Application

Nitrazine Yellow is a pH indicator with a variety of applications

What are the applications of Application

Nitrazine Yellow is used to test vaginal pH during late pregnancy to determine the breakage of the amniotic sac. To perform a fecal pH test for diagnosing intestinal infections or other digestive problems. In civil engineering, to determine the carbonatation spread in concrete structures and therefore assess the state of the rebar's passivation film.

Properties of Nitrazine Yellow

Melting point:	>250°C
storage temp.	2-8°C
solubility	Solubility Soluble in water, acetic acid ethanol
Colour Index	14890
form	Powder
color	Brown to yellow to orange
PH Range	Bright yellow (6.0) to bright blue (7.2)
Water Solubility	Dissolve in water at 1mg/ml
λmax	586nm
Major Application	Sensors, display devices, sol-gel matrix, electrorheological materials, diesel feuls/kerosines, detergent, fabric softner, food storage, method for identifying fresh & stale rice, in dialysis solution, screening of NAD-binding, monitoring secreted body fluids, lymph node, diagnostic pads, vaginal infection test method, assay for esterolyticenzyme activity, detecting pathogenic bacteria, diagnosis of bacterial vaginosis, detecting dysfunctional pregnancy, drugs screening
CAS DataBase Reference	5423-07-4(CAS DataBase Reference)
EPA Substance Registry System	2,7-Naphthalenedisulfonic acid, 3-[(2,4-dinitrophenyl)azo]-4-hydroxy-, disodium salt (5423-07-4)

Safety information for Nitrazine Yellow

Signal word	Danger
Pictogram(s)	Exclamation Mark Irritant GHS07 Health Hazard GHS08
GHS Hazard Statements	H317:Sensitisation, Skin H340:Germ cell mutagenicity H413:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P201:Obtain special instructions before use. P202:Do not handle until all safety precautions have been read and understood. P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P272:Contaminated work clothing should not be allowed out of the workplace. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P308+P313:IF exposed or concerned: Get medical advice/attention. P333+P313:IF SKIN irritation or rash occurs: Get medical advice/attention. P405:Store locked up. P501:Dispose of contents/container to..…