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43 Formation of a heavy preCIpItate, m some wastewaters and effluents, has been reported upon addItion of concentrated sulfunc aCId If thIS IS encountered, the problem sample cannot be analyzed by thIS method 44 Samples contammg sohds must be blended and then mIXed whlle bemg sampled If total mercury vlaues are to be reported NOTE 1: All the above mterferences can be overcome by use of the Manual Mercury method m thIS manual 5. Apparatus 51 Techmcon Auto Analyzer conslstmg of 5 1 1 Sampler II WIth prOVIsIon for sample mlxmg 5 1 2 ManIfold 5.1 3 Proportlonmg Pump II or III 5 1 4 HIgh temperature heatmg bath WIth two dlstlllatlOn colIs (Techmcon Part # 116-0163) m senes 52 Vapor-hqUld separator (FIgure 1) 53 AbsorptlOn cell, 100 mm long, 10 mm dIameter WIth quartz wmdows 54 AtomIC AbsorptlOn Spectrophotometer (See Note 2) Any atomIC absorption umt havmg an open sample presentatlOn area m WhICh to mount the absorptlOn cell IS sUltable Instrument settmgs recommended by the particular manufacturer should be followed NOTE 2: Instruments deSIgned speCIfically for the measurement of mercury usmg the cold vapor technIque are commercIally avallable and may be SubstItuted for the atomIC absorptIon spectrophotometer 55 Mercury Hollow Cathode Lamp Westmghouse WL-22847, argon filled, or eqUlvalent 5.6 Recorder Any multI-range vanable speed recorder that IS compatible WIth the UV detectIon system IS sUltable 57 Source ofcoohng water for Jacketed mlxmg COlI and connector A-7 58 Heat lamp A small readmg lamp WIth 60W bulb may be used to prevent condensation of mOlsture mSlde the cell The lamp IS posltlOned to shme on the absorption cell maintammg the aIr temperature m the cell about 10°C above ambIent 6. Reagents 61 Sulfunc ACId, Conc Reagent grade 6 1 1 Sulfunc aCId, 2 N DIlute 56 ml of conc sulfunc aCId to 1 hter WIth dlstllied water 6 1 2 Sulfunc aCId, 10% Dllute 100 ml conc sulfunc 'aCId to 1 hter WIth dlstllied water 62 Nltnc aCId, Conc Reagent grade oflow mercury content 6 2 1 Nltnc ACId, 0 5% Wash SolutlOn DIlute 5 ml of conc mtnc aCId to 1 hter WIth d1sttlled water 63 Stannous Sulfate Add 50 g stannous sulfate to 500 ml of 2 N sulfunc aCId (6 1 1) ThIS mIxture IS a suspenslOn and should be stIrred contmuously durmg use NOTE 3: Stannous chlonde may be used m place of stannous sulfate 64 SodIum Chlonde-Hydroxylamme Sulfate SolutlOn DIssolve 30 g of sodiUm chlonde and 30 g ofhydroxylamme sulfate m dlstllied water to I hter 2452-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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