Fast Sulphon Black F

Fast Sulphon Black F

Names
IUPAC name 1-hydroxy-8-(2-hydroxy-1-naphthylazo)-2-(4-sulfo-1-naphthylazo)-naphthalene-3,6-disulfonic acid
Other names Fast Sulphon Black
Identifiers
CAS Number	3682-47-1
3D model (Jmol)	Interactive image
ECHA InfoCard	100.020.879
SMILES c1ccc2c(c1)ccc(c2/N=N/c3cc(cc4c3c(c(c(c4)S(=O)(=O)O)/N=N/c5ccc(c6c5cccc6)S(=O)(=O)O)O)S(=O)(=O)O)O
Properties
Chemical formula	C30H20N4O11S3
Molar mass	708.695
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Fast Sulphon Black F is a complexometric indicator used with EDTA, almost exclusively used in copper complexation determination.

Application

Fast Sulphon Black is purple when complexed with copper, and turns green when titrated against EDTA,^[1] as the EDTA displaces it, being the better complexing agent due to the chelate effect.

References

1. Trimukhe, K.D.; Varma, A.J. (2008). "Complexation of heavy metals by crosslinked chitin and its deacetylated derivatives". Carbohydrate Polymers. 71 (1): 66–73. doi:10.1016/j.carbpol.2007.05.016.

• Handbook of copper compounds and applications by H. Wayne Richardson (1997) (ISBN 0-82-478998-9)