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<br />M,¢~-G~c~c~(s
<br />Aug 5,9~
<br />i
<br />G:15 IJu.OG~
<br />!?~ EdItJ~,o~
<br />rNOHOANIC NONMETACB (~~00) ~;.
<br />+ ~'~ .N t 3CI, 6haCl
<br />)({(y++N, :11,0 O)
<br />~,. Ca 1- al9o rill hr r~ ~ r~h•` ,", acidiA•
<br />2
<br />Ilaak u+ by the
<br />~e cyarrogerr tblorlde procedure 19 c¢m-
<br />moo with the colarimrtric test for cyan~da
<br />~sa+e+sble to chlorination, ThIA lent Is bgsed
<br />•Ob pddirion of chloramine•i' end ub-
<br />lor complex formation with ar-
<br />Liru~AACid. Without the addilio of
<br />cs•. ;mine•T, only ealsring CNCI is ar-
<br />l~lt ell. N' ~~' .. i r~t ;ja.:~ •- ;,.r~ (,'NC1 +9 A gAS tier hydiolyLC 10
<br />ads , f ,5 , ~ ~r ; , ~. r'":O • sample preservation i9 not puss ble.
<br />, : 15 can the J~. ':~ ~.,na,~~, ",, t.•: h Becnusc of lids, elwt resting of CNCI l vets
<br />a • p.~ • : ns-lox,. • • rl . an : ~•rr. nia> be best. this procedure can beads tod
<br />I ', ,.'' a9 nl(Irl. "Ot" '. sit,-,, e,:•] 9.: ~ Used WhCn IhG Sample 19 COIICCIC
<br />{ ': ,+. n~'t dislocfalr ~••add. ihr chl•,~ lhae may bs analylicel rrqulre nls
<br />r'. ~ ~~ . .r,~Niltr~thrrer.+'~ ,•~,rfrec nrc•re for the determination of CNO', van
<br />t~~ ~~ s a signiflcanr :Pl. ~n< tssr,t" rh•nlgh Iht reported lo):Iciry Ievci 19 ow.
<br />i-'~• y• ••'es herau.u rlrry ~,+ oct J,s'. ur. ncidifcatian, CNO~ decompose to
<br />r ,~ .~ ate. drgrra are nor o'htvr: h) ammsmia (NH,).t Molecular emmoni and
<br />cnl,n,.. ~~ r :'r• .t ca:r1,.U.a1 'T-°14rr1: n~C'MI anlnlOllla complexes ar< h hly
<br />I tb- ref~=:b•~, r ~r• ' i tl r no,rd ~ovr
<br />, tea lc
<br />1 plrsrs .II U,r ' ~ ....,r ru d~Ib~ineG-,n 7ki•>rymlare (SCN-) i9 vot rcrY t0 a to
<br />end Ia<f of 1~5a • ayo-ntit Iife.+ However, upon chlorine ion,
<br />I!1:
<br />~, tr IS a~'' aYtJ~^O~.S IU d~tt'trrUlre't r.,5ir CNCI !s formed, as disc ssed
<br />'
<br />I hers; ~r rural tah~:rr ~' i • 1'nnldes ~•nc- Arwr'~''" At least where substqurnt hlo•
<br />J
<br />~,at~ •6},ra^•.,~,: Wt,.~n r:~~tal ;~~r,ide rlnnu~~~i is anticipated, the detcrmin lion
<br />I
<br />Is ner.,n;u.e•! !hr rirln;r n•,rdis,•..,,NMr r•f SCN- is desirAMe. Thiocyannrt is bio•
<br />"yan,nr< o. a-II rt: "ya,.~ •. t,.„,,,•1 h, crn~~ dcp5ddable, nmmoniwn i9 rclcnscd I thi9
<br />I+1.•et' thr~ a r -^.51, .'~+•'•r,Ahlr nnA :om• ,cac!ion. lhioc)annte may be analyr. d In
<br />p1e.:•• rd nn^••nrdlar• }•Nh~t.•) a~r sairpks properly preserved for del rmi•
<br />n~,re~~;r' (.arlde ~ n.~.o:n .c u.^; ere nation of cyanide, howtveq fhiocy note
<br />a,,.=•,Ah r.~ 5hw:inai,on h~ b de hee cs~ Also :en be preserved in
<br />samp
<br />~es by cld-
<br />anlde AS w-I! N+ 1'. .. a ..pits c)e'•I~1„ ••
<br />1
<br />iftcArinn N'Ith H,SO, t0 pk 5'L.
<br />lI'N, P„ 14.L.•~.IA'~. 1n ~ ,:S~,IC. AIa1 Ja1
<br />wh.~IlY of In la. gr .lc~r, amt .hr,«FcrS ~ C•yanldO In SOlld WaBIB
<br />purtnunlly t••>-,i, al law e•,n~~rntretwas,
<br />evrn it rhr da,F i r,r , n4,rhrNn ,n rr•sr pro a. Snluhfe cyanide: I)eterminarion f aol-
<br />crdure , , errled Ou: u*~drr rlp,~~nu9 con able cyanide requires enmplt Ieaehin with
<br />dn~on• apprapru~• };;r n'r::<urrnlydf of the distilled water until solubility equlli rlum
<br />rrvr~e d,ss•, ciaDle forms of cy unidc is established. Ouc hour of Stirring ( din-
<br />/tlternAh t'tly, Itlr Irtt and potcnliAlly' tilled wale sLould be estisfectory. C aide
<br />~ d1490Ciahit Cy en ldrs a1t0 1110) f•e e6lhllattd ppPIy 94 is rhea performed on lie Ica hate.
<br />Nhrn using the N'eak ac+d disao['labfr pro Cow cyauidc concentration in the le chore
<br />ttdure 'ihrse methods depend on n rlg~ rosy indicate presence of Sparingly s table
<br />orous distillation, bur the solution i9 only nrcrAl cyanides. 'l~hc cyanide content f the
<br />slightly aeidified, And elimination of iron leachale hr
<br />' aa~ive of re91dua1 90l bility
<br />cyanidts is insured by the earlier additic ~
<br />of Insoluhl 1 cyanldea In the w sle.
<br />Of precipitation chetnieala to the distillation }fipl+ le Is of cyanide In lire le chafe
<br />c9u,n •~ NI1,'
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<br />F•.oa,roa
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<br />t. ' i` y= ~
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