Method of analyzing the complexing power of a pickling liquor

Details Method of analyzing the complexing power of a pickling liquor Method of analyzing the complexing power of a pickling liquor

1991-08-01

1994-02-15

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

134 2, 134 3, 134 41, 436101, 436125, 204405, C23G 102, G01N 3300

Patent

active

052863581

ABSTRACT:
A method is provided for accurately determining the complexing capacity (or free HF concentration) of a pickling liquor. A sample of pickling liquor is obtained and an excess of ferric ion is added thereto to complex with all of the free HF in the sample. A back titration is performed to determine the residual free ferric ion. The difference between the amount of ferric ion added and that found by the titration is related to the free HF in the original sample.
The method is useful in conjunction with an automated, on-line system which periodically monitors a pickling bath and makes any necessary adjustments thereto.

REFERENCES:
patent: 3027240 (1962-03-01), Bartell et al.
patent: 3393980 (1968-07-01), Johnson et al.
patent: 3542518 (1970-11-01), Morrow
patent: 5154774 (1992-10-01), Bousquet et al.
McKaveney, J. P., Analytical Chemistry, vol. 40, No. 8, pp. 1276-1279 (Jul. 1968).

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