ANALYTICAL PROCEDURE. 239 
Analyses of the Copper Implements.—Continued. 


\ 

















Loss of in- Percentage composition. 
soluble : eee een Sa — 
material | 
Notot treated | 
sample with hy- | 
2 drofluoric | Copper. Lead. Iron. Cobalt. Nickel. |Antimony.| Arsenic. ‘Din. Sul- Total 
acid and | phur. 
sulphuric 
acid. 
Grams 
NY 09S Sigs os i Paan ch Sede es) Te we Ee. Ae ey cheer bee paw < INODErEeerieca los eee 
SES ETERS Sent. Sect Neda as Aa dsle ase Weees (ons va Val 1. oe aa WW Noney sles eanl ora 
N.K. 83 | 0.0061 | 58.27 ORScul LLAce mime nee talee eee. Ona O, Osu lmeNONGs yeaa ie las. 
ER RIO Miers Es, Guat oidieaier> Pou ia wal | dene be Loewe dd | above cs NGneiaee iit eae 
CL RT a A a ee ed ene Re La ann, es EANONGy eset oH eee es 
LE GSN os eis Pee | ee oo ee a rs a eee iP INGHEA eof es., 
eK 274 | 0.0002 | 93.21 On33 0.06 | None. | None. Ours 4.88 | None, | .... | 98.63 
REO ZEROS OOOOH face Hhtsceeca || weave. 2 lee Aerts es Bhs ie. ste tree fo Nonew |S. te Wh see 
eer as MOZOTIAu eet fe tee sede tevat ihc ted tomes cece”: cell), othe anatis a NoneSei—e nae. seer 
pameoesr WeNane. 1 ..... f b...5. ee en x: Bee ek ceaee aera Ouest ee ie sae 
SLE ACE Ie Ae Nee Ses FF O44 LIGCe A. days 2 Pete. Sole en Aer De cee Noneme 3 Pe: 
Oe SE A ay i a es ce, ee nr ae, este Pe NOTE Sites Meh acts 
SS OTe es coe 70.42 21.69 0.46 | None. None, 0.41 0.49 Boa een hk OGLE 
Peo MTOLOrsE Foe. dens Jokes: Ca Pete TAR eek a Hee Nowe) Whe, 
SemerOG fen ics ks | 95-39 0.14 0.76 | None. | 0.02 0.61 2.04 | None. | .... | 98.96 | 
Sw Ken rgg | 0.00731 55.58 0.37 | Trace. | None 0.04 0.16 Gi GAs NONE. Wks. ) sec 
SS AO eee ae 97-74 0.38 | Trace. | Trace. | 0.07 0.04 ASE ||, Niet |} Boge i Crvacle 
PAD Yoox. 2... 95.19 I2o 1.08 | None. | None 0.08 2 None, | .... | 99.84 
ker reagan An”. | 94.58 Orr 0.47 | None. | None. | Trace. | 4.43) None. | 0.08 | 99.69 
S.K. 144 | 0.0092 | 50.63 | None. | 0.84] None. | Trace 0.97 2AO "Ie NONE SED cei taeeen © 
S.K. 40 | 0.0355 | 78.43 @.62 |, Trace. | None, | 0:32 0.22 0.44 SceEre ek Neon ces 
ee aOT 1 Oi0084 | os. i ee Care Mess. ae Ete TPace vik Rees ie OLS Uaeere |i te bs 
S.K. 61 | 0.0026 | 41.83 0.51 | Trace. | None. | 0.01 GeilGay) NONE AIS CLESSo Pac tl woes 
Beeeerat 150200 | ..... oor GE Rice! Ue eg My ah None? cee. PONOUG nee | ye ek: 
i A Gr reo ie (i an | are eee ere ae os Cowl cumb, pvt Seek ths Facade oye Noneri 207 -as ee 
S.K. 145 | 0.0005 8.85 | None erg) brace 0.06 0.10 0.38 OWS Olle. sonia y es 
S.K. 205 | 0.0402 | 37.20 0.59 0.53 None | 0-03 Ons ORO 74 NOM Clair ney aha era. 
SS 7710 Be ae Jorseee | cree ce ees rare [teres layers. srs Se? | NOt eal hr oe Vee reulal ste 
| { { | { | 


VII. TREATMENT OF THE FILTRATE FROM CUPROUS SULPHOCYANIDE. 
The filtrate from the precipitated cuprous sulphocyanide was boiled down to 
a third of its volume to remove sulphur dioxide, and hydrogen sulphide was passed 
into the hot solution. The precipitate (which might contain sulphides of antimony 
and arsenic with traces of sulphides of lead and copper and possibly of tin in case 
ammonium hydroxide had not been used in I to effect complete hydrolysis of the 
salts) was collected upon paper and washed. The filtrate was reserved. 
VIII. TREATMENT OF THE PRECIPITATE BY HYDROGEN SULPHIDE IN PRESENCE OF LEAD. 
The precipitate by hydrogen sulphide in the acidulated and concentrated 
solution left after removal of cuprous sulphocyanide was treated on the filter 
with sodium sulphide, and the filter was washed. The solution, which might 
contain sodium arsenate and sodium antimonate and traces of sodium stannate in 
case ammonium hydroxide had not been used to complete the formation of meta- 
stannic acid in the first nitric acid treatment, was treated according to the methods 
of section IV for the determination of antimony as antimony trisulphide, of 
arsenic as arsenic pentasulphide, and (if necessary) of tin as stannic oxide. The 
residue left upon the filter after treatment of precipitated sulphides with sodium 
sulphide was ignited with the filter and treated for the determination of lead as lead 
sulphate, and for copper as copper oxide, according to the methods of section III. 

