PDF Publication Title:
Text from PDF Page: 054
&EPA Test Method pH, Continuous Monitoring (Electrometric)-Method 150.2 United States Environmental Protection Agency Research and Development Environmental Monitoring and Support Laboratory CinCinnati OH 45268 1 Scope and Application 1 1 ThiS method IS applicable to the continuous pH measurement of dnnkrng surface, and saline waters domestic and rndustnal waste waters detergent washrng The use of flow- through electrode housings which prOVide higher flow velOCity helps to prevent the coatrng action 4 3 2 Heavy particulate matter such as lime accumulation can be removed by careful scrubbmg or ImmerSIOn In dilute (1+9) hydrochlonc aCid Continuous mOnitoring under these conditions benefits from ultraSOnic or other In-line contmuous cleaning methods 4 4 Temperature effects on the eJectrometrrc measurement of pH anse from two sources The first IS caused by the change In electrode output at vanous temperatures ThiS Interference can be controlled with Instruments having temperature compensation or by calibrating the electrode-Instrument system at the temperature of the samples For best results meters having automatic temperature compensation should be calibrated with solutions within 5°C of the temperature of the stream to be measured The second source IS the change of pH Inherent m the sample at varrous temperatures ThIS error IS sample dependent and cannot be controlled, It should therefore be noted by reportmg both the pH and temperature at the time of analysIs 5 Apparatus 5 1 pH Monitor - A Wide vanety of Instruments are commercially available with vanous speCifications and optional equipment For unattended use, the monitor should be eqUipped with automatic or fixed Summary of Method 3 Sample Handlmg and Preservation 3 1 The composition of the water or waste contactmg the measunng electrode system must be representative of the total flow from the water body 4 Interferences 4 1 The glass electrode rn general, IS not subject to solution Interferences from color turbidity colloidal matter oXIdants reductants or high salinity 4 2 Sodium error at pH levels greater than 10 can be reduced or 2 The pH of a sample IS determmed 2 1 electrometncally usrng a glass electrode with a reference electrode or a smgle combrnatlOn electrode elimrnated by uSing a error electrode low sodium 4 3 Manually mspect the conditions of the electrodes every 30 days for coatmg by Oily matenals or bUildup of lIme If 011 and grease and/or scale bUildup are not present, thiS time mterval may be extended 4 3 1 Coatmgs of 011, grease and very fine solids can Impair electrode response These can usually be removed by gentle Wiping and 1502 1 Dec 1982PDF Image | Methods for Chemical Analysis of Water and Wastes
PDF Search Title:
Methods for Chemical Analysis of Water and WastesOriginal File Name Searched:
epa600_4_79_020.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)