Vʯ̿ ҬS̿E
ڵVʯ̿c{Yϵ|ϱMМyԇCû̿MSἃЧ
ҬuSҬ̿wȾĥȸߵc,mڬFVɽaҪڶѽ̿{ȡSұI(y)Fٵķxȡ
1.Ҫ
ԇˮֽϡˮ|û̿𣬻̿һƟˮHC1|NH4HF2 EDTAڱFeCuȸɔ_ԪKIAu3+߀ԭAu+ͬrxI2Ե۞ָʾc˜ҺζmһVʯωAu/10^-60.XĜy
2.ԇ
̿һ{̎̿0.074mmĻ̿20 g/L NH3HF2Һн3 d,^VHCl(298)ˮϴ78̎Ļ̿c{Ըɕr|Ȱ12
˜ҺQȡ0.0500g99.99%ϣ100 mL10 mLˮw6070ˮԡϼӟܽ810250 g/L NaClҺڷˮԡϼȡ1 mL HCl^m(x)ڷˮԡɡȡ¼ˮʹ}ȫܣȡҜʢ5 mL HCl500 mLƿУˮϡ̶Һ100μg /mLAu
c˜ҺQȡ25.2gcNa2S2O3·5H2Oкssˮ0.lg Na2CO3ˮϡ1LҺpH7.27.5Һ1 mLஔ10 mgAu
քeȡ30 mL100 mLҺ 10L¿ƿȣ1goˮ̼c310 mLȷsеsˮϡ10LuһܺMИ˶ȡ5mL10mL˜Һ50mL35250g/L NaClҺ23 mLˮˮԡ34HCl؏̓ɴȻÃɷNc˜Һζ1 mLҺஔ|1 mLքeஔ30μg100μgμg /mL
3.E
Qȡ1030g_0.01gԇڴɷڸߜؠt600Ɵ40minȡԇD400mLУˮl00mLˮ11ӟ3060 mingu100120 mLҺעBbл̿-{IJ©ßHCl2ʮ98Һϴ̿34ΣßHCl298ϴ34Üˮϴ34Σȡ̿-{50 mLУ늠tPϵ͜غ̿650700ߜؠtƟo̿ȡsڴȼ5250g/L NaClҴڼ23 mLˮڷˮԡμ35HCl^m(x)؏̓ɴΣoζȡ壬35 mLᣨ7ʮ93ʹ}ȫܽҜء0.1 g NH4HF2μӔ25g/L EDTAҺ0.5 g KI,c˜ҺζSɫ3510 g/LҺ^m(x)ζ{ɫʧKc
ʽӋԇнĺ
Au(g/t)=V*T/m
ʽ T —1 mL Na2S2O3˜Һஔڽ|μg/mL
V—ζrNa2S2O3˜ҺwemL
m——Qȡԇӵ|g
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