
14
14
14
14----2
2
2
2
The following reducing agents may result in an elevated background current
when present at low levels (only a few milligrams per liter):
Aniline
Phenol
Thiocarboyhdrazide
Thiourea
Resorcinol
Guaiacol
2-Mercaptoethanol
Ethyl Carbazate
Formic Acid Hydrazide
Catechol
Acetaminophen
The following materials may cause trouble at higher concentrations:
2-Amino-4-nitrophenol
Hydroquinone
p-Cresol
p-Phenylenediame
Isoniazid
o-Toluidine
Methimazole
2-Hydroxybenzyl Alcohol
4-Ethylphenol
p-Aminophenol
Pyrogallol
Oxalyl Dihydrazide
N.N-Dimethylhydroxylamine
Sodium Azide
Calibration Shift by Detergents
Calibration Shift by Detergents
Calibration Shift by Detergents
Calibration Shift by Detergents
The sensitivity of the platinum anode of the sensor is affected somewhat by
absorption or desorption of material from the buffer which bathes it. In normal
operation, such changes are quite gradual and are corrected in the periodic
recalibration of the instrument. However, concentrated detergent solutions may
have a much more sudden effect. Concentrated anionic detergents can cause
readings to be abruptly elevated or depressed; concentrated nonionic detergents
generally depress readings. For this reason, concentrated detergent solutions
should not be sampled. No problem has been observed from the naturally
occurring detergency of specimens.
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