Suvarna Garge (Editor)

Nitrazine

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Formula
  
C16H10N4O11S2

Molar mass
  
498.4 g/mol


Nitrazine or phenaphthazine is a pH indicator dye often used in medicine. More sensitive than litmus, nitrazine indicates pH in the range of 4.5 to 7.5. Nitrazine is usually used as the disodium salt.

Contents

Ph nitrazine yellow measure meat ph


Use

  • This test is done to ascertain the nature of fluid in the vagina during pregnancy especially when premature rupture of membranes is suspected(PROM).
  • This test involves putting a drop of fluid obtained from the vagina onto paper strips containing Nitrazine dye. The strips change color depending on the pH of the fluid. The strips will turn blue if the pH is greater than 6.0. A blue strip means it's more likely the membranes have ruptured.

    • This test, however, can produce false positives. If blood gets in the sample or if there is an infection present, the pH of the vaginal fluid may be higher than normal. Semen also has a higher pH, so recent vaginal intercourse can produce a false reading.

  • 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.

    • References

    Nitrazine Wikipedia
    (Text) CC BY-SA