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i YlYl <br />~) D 4374 <br />' aces the <br />Ihiocya- <br />cyanate. <br />le, were <br />ak down <br />with the <br />.s in the <br />variable <br />nination. <br />lac basis. <br />ut 5 µg1L <br />1d can be <br />J cysteine <br />rations in <br />rte can be <br />ride mea- <br />i~ TO Rt3iYN[ <br />I Y.Y." <br />nLY i{soYlTro{ IaRNOUnoY <br />O LYC" <br />TRIY LILY <br />plarlu[noY <br />an <br />T11i/ <br />..STE <br />xl)tl0 <br />)) t-LYC" LYE•" tYC~ <br />l <br />~`r 11[COaO[N CO10111Y[TU ~- <br />I[IFTCC /i!T[ [[O 1~ <br />OITIOXIL I[r lL0/ C[LL YqT[ <br />~ a~T. Iaa1D1iT10N ON LIYL IOR TOTLL LTNYIp[ Nip {YNS[[0 rOR !IY/LC CTi MID[ <br />• [YC a/LYC: [NOIIT LYD LOYL YI[ IY[ LOIL[ <br />FIG. 1 Manifold for Automated Cyanide System <br />(1:1). <br />-mm flow <br />which are <br />r unit and <br />ping and a <br />horizontal <br />diameter). <br />• a slope of <br />pus flow of <br />acted to a <br />Ira long. to <br />an-distilled <br />trap (C). <br />piece unit. <br />by a l2l' <br />e l2). This <br />by 22-mm <br />-ound glass <br />to (tows by <br />piece and <br />tube, When <br />~m the sidr <br />flexible tubing between the gla:+s connector and the distilla- <br />tion unit. <br />7.7.2 Do not use flexible tt.bing between the thin film <br />distillation and the absorption toil, nor from the absorption <br />coil to the debubbler before re..ampling. These connexions <br />should be made with glass tubing and Fluorocazbon10 sleeves. <br />7.7.3 The waste tube from the debubbler, before resam- <br />pling, should be wide and as shim as possible (< 8 cm) with <br />a free ending. <br />7.8 A dual channel automated cyanide system could be <br />made, one channel with the UV irzadiator for total cyanide, <br />and the second channel without UV unit for the tiissociable <br />cyanide. <br />e unit basi' <br />tore control <br />ales heat ti <br />rature of Ihi <br />8. Reagents <br />8.1 Purity oJReagents-Reagent grade chemicals shall be <br />used in all tests. Unless otherwise indicated, it is intended <br />that all reagents shall conform to the specification of the <br />Committee on Analytical Reagents of the American Chem- <br />ical Society,t' where such specif cations aze available. Other <br />grades may be used, provided it is first ascertained that the <br />reagent is of sufficiently high purity to permit its use without <br />lessening the accuracy of the determination. <br />8.2 Purity of Water-Unless otherwise indicated, refer- <br />ences to water (not sample wal.er) shall be understood to <br />mean reagent water conformin; to Specification D 1193, <br />Type II. <br />8.3 Reagents for Screening and Treatment of Interfer- <br />ences: <br />8.3.1 Lead Acetate and Potassium Iodide-Starch Paper. <br />8.3.2 Lead or Cadmium Carbonate. <br />8.3.3 Oxalic and Su(Jamic Aclds. <br />Technicon ln` <br />1 also lx suitpM~' <br />heating bar is regulated with a 150-W cartridge heater and a <br />variable transformer. The temperature is monitored by a dial <br />thermometer. <br />7.4 Gas Absorber-Absorption of HCN gas is achieved by <br />forcing the gas mixture and 0.02 M NaOH solution through <br />an absorption glass coil (2.4-mm inside diameter and 28 <br />toms), as shown in Fig. 2. The coil should be placed <br />horizontally or sloped downwazds at any desirable angle to <br />ease the Oow. <br />7.5 Ultraviolet (UV) Irradiator-Figure 3 presents a sche- <br />matic of the UV irradiator used for the breakdown of the <br />complex cyanides. Basically it is similaz to preriously devel- <br />oped irradiators (10) with some improvements and consists <br />of the following components (or equivalent): <br />7.5.1 UV Photo-Chemicaf Lamp, 550-W.' <br />7.5.2 Transformer AC, 550-W, I05 to 125 V, 60 cycles,g <br />with an on-off switch and a tickler circuit. <br />. 7.5.3 Cooling Miniature Fan, 12 by 7.Scm, l IS V, 60 <br />cycles' (activated by the same switch as the UV lamp). <br />.7.5.4 Quartz Coil made from 3-mm inside diameter <br />tubing, the coil is 10 to I 1 cm in diameter and 30 turns. <br />7.5.5 Housing of UV Irradiator. <br />:7,6 Nitrogen Gas-Nitrogen is used instead of air to <br />se~nent the flow going to the UV irradiator. This is to <br />prevent ozone formation, an undesirable oxidant. <br />7.6.1 Nitrogen Gas Cylinder, with proper regulators. <br />7.7 Some Imponant Connections: <br />7.7:1 The air flow (from the Eve pump tubes) and the <br />liquid flow from UV irradiator should lead directly (simulta- <br />neously) into the thin film distillation unit by means of a <br />!Blass connexor with fluorocarbon10 sleeve. Do not use any <br />°.i~:, .. <br />Irr UY IampType Ab71A•36, Conrad Precision Industries,'Newark NJ,.or <br />e9uiralent. <br />+[ Transformer, Conrad Precision Industriq Newark, NJ, or equivalent. <br />~Minia[ure Fan, McMaster Carr, Catalogue No. 1979-K-I4, or equivalent. <br />,~D Teaon or Acidnex tubing •~ - -1 <br />" `Reagent Chemicals, American Chnniwl Saiery Spttifintions," Am. <br />ChemiW Soc., Washington, a. For suggegions on the testing of reagents not <br />listed by the American Chemical Sonny, see "Reagent Chemicals and Sundards," <br />by Joseph Rosin, D. Yan Nostrand Co., Inc., New York, NY. and the "United <br />Soles Pharmacopeia." <br />107 <br />NITSOiLM <br />SLY/lLR YITN `iIi RLR 130/Sr <br />¢lo m <br />.IN <br />NIR <br />.111 <br />.1R <br />u{ <br />eurleR <br />•••R[31YRLC <br />L IR ([IR {LRI <br />[RLORLYIYC-T <br />COLOa IIERNMT <br />