Boots – shoes – and leggings
Patent
1975-10-30
1977-11-29
Morrison, Malcolm A.
Boots, shoes, and leggings
204 1T, 204195R, 204195M, 324 71R, 364900, G06F 1520, G01N 2726
Patent
active
040607178
ABSTRACT:
An instrumentthat determines the HF and the HNO.sub.3 concentration or other mixed acids or single acid of an acid bath measures the potential difference between a fluoride ion selective electrode and a reference electrode and the potential difference between a hydrogen ion selective electrode and the reference electrode. The electrode voltages are applied to a control circuit including a microprocessing unit for calculating and displaying the acid concentrations of the bath and for compensating for the nonlinearity of the measured voltages as well as the interdependence of the two voltages. Also, means are provided for calculating and displaying percent metal concentrations.
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patent: 3920969 (1975-11-01), Berglas
Manahan, S., Fluoride Electrode as a Reference in the Determination of Nitrate Ion; Analytical Chemistry, vol. 42, no. 1, Jan. 1970, pp. 128-129.
Rechnitz, G., Ion Selective Electrodes; C & EN; June 12, 1967, pp. 146-158.
Krass Errol A.
Leco Corporation
Morrison Malcolm A.
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