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1
, ,
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, 2013/2014. [email protected]
,
- . . . - , , . , . . , , , . , . . - . - , , . , . . . - , -, , , , .
1.
+. 0 14. :
7
. , [+] 1.
pH = log [H+] . (1.1)
, . .
pH = log aH+ = log [ + ] , (1.2) : aH
+
-
,
2
- .
(1.1) (1.2) aH+. , . , 1.
25 1 mol/dm3 10-7 + -, 7. 1 mol/dm3 1 mol HCl , 10-14 + 1 mol/dm3. , + - 14 , :
1,008 10 moldm 1.3
Ka + 1, . =10 110-10 10-10 1.
:
|"# R%F ln
()*
2,3 R%F log -0,1984 %0" -59,1 1.4 : R- , - , F- , - , )*- .
2.
.
2.1
, . () . ( 2.1) 1.
:
2 2,3 R%F 3log 4 - log 5 . 2.1
2.1: .
3
4 1mol/dm , . , :
2 -59,1 log 59,1 mV. 2.2
, 0,01 , 0,591 mV. O 14 108 10mol/dm . K =7 0,01 , 109mol/dm 2,3 10: mol/dm.
T=298 K (25C), :
dE/dT0,1984TpH [mV/C] . ( 2.3)
. . [1].
, . . .
: , , , . , . , .
- , . . 4,44 0,2 [V] 25 . , + . 1[bar].
- . Pt- , AgCl. Pt- . , . =0,2224 V.
- . 5 mm. -. , .
pH - pH . . . pH (0-13), 0-100[ ] 0,1-0,5 []. : 5[mm], 10-12[mm], 100[mm]. .
4
- . . , . N- . [1].
- . . 10 [m], 1[m], 0,5[s], [1].
pHFET- (ISFET-ion sensitive field effect transistor) . ISFET, - pHFET , - FET (MOSFET), . . . , , , , [4.
2.2 ,
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2.2.1
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2.2.2 , , ,
, . , . , , 4.
3. -
- , - . - 1936 . - . .
pH pH- CyberScan CON 510 ( EUTECH-) pH- 5722 (). .
5
3.1 pH- CyberScan CON 510 , pH ,
(TDS) . - TDS . LCD . pH .
3.1: pH- CyberScan CON 510. .
. . . . . .
3.2 pH- 5722 pH
. , . .
pH 0-14 0,02 pH, -1999 mV +1999 mV 0,1% 2 V.
1000 . . .
2x9 V, 220 V . . , 10 .
3.2: . 3.3: .
6
4.
CyberScan CON 510 5722 . , .
4.1: . : -. : - CyberScan CON 510, , - 5722,
, . : 4,7 9, , .
:
) - CyberScan CON 510
1. ON . 2. -
, . . . .
. .
, .
: 1. , MODE . 2. ,
. 3. . ,
. . 4. CAL/MEAS . 5. READY ENTER
. 6. CAL/MEAS .
. 7. ,
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7
1) : 1. 2. .
. 3. . READY
2) 7.
. .
3) . 9. .
) 5722
: 7, . :
1. 7 . 2. GLASS or COMBINED . 3. , 2 cm. . 4. . 5. N.
7 0,01. 7 BAL 7.
6. , 0...14 . 7. STANDARDIZE 7 0,01, .
7. . . SLOPE .
8. . 9.
. .
: A) CyberScan CON 510
A
4 2,52 2-3 7 7,01 7 9 8,11 9
. . . ,
8
. .
B) 5722 . . 20 , 5 . .
5.
. , . , , . , , . - . . , pHFET / , . . ( ) , - . .
7.
[1] , , , , 2002. [2] . , , - , 2010. [3] ., , , 2010. [4 JohnG. Webster , The Masurment, Instrumentation and Sensors Handbook, CRC Press LLC, 1999. 5 www.industrijska-merenja.com 6 CyberScan CON 510 EUTECH- 7 - 5722 (),