CS207266B1 - Connection for automatic determination of concentration of chemical substances by galvanostatic dissolution analysis - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to an apparatus for automatically evaluating the concentration of chemicals in a galvanostatic dissolution analysis.

In the galvanostatic dissolution analysis, the time dependence of the electrode potential polarized by the constant current to which the element or elements had previously been applied is registered. When determining the concentration of the substance to be deposited on the electrode, the so-called transition time, i.e. the time during which the monitored electrode process takes place, is measured during the dissolution that occurs when a constant current is passed through the electrode system. The measurement of the transition time is performed either from graphical records of the time dependence of the electrode potential, or by automatic digital measurement of the transition times in chronopotentiometry. By using this apparatus, several transition times can be measured in close succession when analyzing a solution containing several determined components.

The transition time in the galvanostatic dissolution analysis is proportional to the concentration of the substance in solution. However, when calculating the concentration of the substance to be examined in solution, the measured transition time shall be multiplied by a factor including the Sandt equation parameter and the electrolyte accumulation parameter, which can be determined by measuring a standard sample under standard conditions. However, when measuring large series of samples, this method of evaluating the results obtained is relatively lengthy, since each result must be multiplied by this factor separately to obtain sample concentration data. These disadvantages are overcome by a device for automatically determining the concentration of chemicals in the galvanostatic dissolution analysis of the present invention.

SUMMARY OF THE INVENTION The present invention provides a monostable circuit comparator having an output coupled to a pulse source input having three outputs, each separately and separately connected to a memory circuit counter and printer input, with a line between the memory circuit output and the printer input. a display is connected, and a gate is connected to the line between the output of the monostable circuit comparator and the pulse source output, through which the clock pulse generator is connected to a counter, the generator is connected to a circuit arranged to set the desired clock pulse generator frequency and clock pulse generator , the gate, the counter, the memory circuit, and the printer are connected one after the other.

The device according to the invention can be used in the automatic evaluation of the concentration of the analyzed substances in the galvanostatic dissolution analysis.

The attached drawing shows a diagram of a device for automatic concentration evaluation in a galvanostatic dissolution analysis. The device shown in FIG. Consists of a comparator circuit with a monostable circuit 1 which is connected to a gate 2 connected via a clock pulse generator 4 to a circuit 9 for setting the desired clock frequency of the clock pulse generator, and the gate output 2 is connected via counter 3 a control pulse source 6 connected to a memory circuit 5, the output of which is connected to a printer 8, is connected to the comparator circuit and the monostable circuit 1, and to the printer 8 is connected to the memory circuit 5 to the printer 8. enter display 7.

The possibility of using the device according to the invention is evident from the following exemplary embodiment:

The derivative waveform of the potential of the polarizable electrode immersed in the standard solution is fed to the comparator circuit and the monostable circuit 1 which generates control pulses for gate 2 controlling counter 3. Counter 3 is filled with pulses from the 4 hour pulse generator for the duration of the transition time. The state of the counter 3 indicating the duration of the transition time is transferred to the memory circuit 5 by means of a pulse from the pulse source 6 after the transition time measurement has been completed. The reading stored in the memory circuit 5 can be read on the display 7 or recorded by the printer 8. This reading indicates the transition time in the galvanostatic determination of a standard analyze ion solution. In order for the reading on the display 7 to correspond directly to the concentration of the standard sample, the frequency of the 4-hour pulse generator is set before the second, i.e. repeated measurement of the same solution, by the circuit 9 so that the reading on the display 7 or recorded by the printer 8 indicates the concentration of the solution in the required units . The samples are then analyzed.

Claims (1)

SUBJECT Apparatus for the automatic determination of the concentration of chemicals in a galvanostatic dissolution analysis characterized in that it consists of a comparator circuit with a monostable circuit (1), the output of which is connected to the input of a pulse source (6) provided with three outputs. a counter (3) input, a memory circuit (5) and a printer (8), and connected to a line between the memory circuit output (5) and a printer input (8) 1 ex The display (7) and to the line between the output of the comparator circuit with the monostable circuit (1) and the input of the pulse source (6) is connected by a gate (2) through which the clock pulse generator (4) is connected to counter (3); 4) is connected to a circuit (9) arranged to set the desired frequency of the clock pulse generator (4) and the clock pulse generator (4), gate (2), counter (3), memory circuit (5) and printer (8) are connected behind.