27. Cov dej tag nrho yog dab tsi?
Qhov taw qhia qhia txog tag nrho cov ntsiab lus hauv dej yog tag nrho cov khib nyiab, uas tau muab faib ua ob ntu: cov khoom tsis hloov pauv tag nrho thiab cov khoom tsis hloov pauv tag nrho. Tag nrho cov khib nyiab suav nrog cov khib nyiab tshem tawm (SS) thiab cov khib nyiab yaj (DS), txhua qhov tuaj yeem muab faib ntxiv rau hauv cov khib nyiab tsis hloov pauv thiab cov khoom tsis hloov pauv.
Txoj kev ntsuas ntawm tag nrho cov khib nyiab yog ntsuas qhov loj ntawm cov khoom seem tom qab cov dej khib nyiab tau evaporated ntawm 103oC ~ 105oC. Lub sij hawm ziab thiab qhov luaj li cas ntawm cov khoom muaj feem cuam tshuam nrog lub tshuab ziab khaub ncaws siv, tab sis nyob rau hauv txhua rooj plaub, qhov ntev ntawm lub sij hawm ziab yuav tsum yog raws li qhov ua tiav evaporation ntawm cov dej hauv cov qauv dej kom txog thaum qhov loj. tas li tom qab ziab.
Volatile tag nrho cov khib nyiab sawv cev rau cov khoom hnyav txo los ntawm kev hlawv tag nrho cov khib nyiab ntawm qhov kub ntawm 600oC, yog li nws tseem hu ua qhov hnyav poob los ntawm kev kub hnyiab, thiab tuaj yeem kwv yees cov ntsiab lus ntawm cov organic teeb meem hauv dej. Lub sij hawm ignition kuj zoo li lub sij hawm ziab thaum ntsuas tag nrho cov khib nyiab. Nws yuav tsum tau hlawv kom txog thaum tag nrho cov pa roj carbon nyob rau hauv cov qauv tau evaporated. Qhov loj ntawm cov khoom seem tom qab hlawv yog cov khoom ruaj khov, tseem hu ua tshauv, uas tuaj yeem sawv cev rau cov ntsiab lus ntawm inorganic teeb meem hauv dej.
28.Dab tsi yog cov khoom yaj yaj?
Dissolved solids kuj hu ua filterable substances. Cov lim dej tom qab lim cov khib nyiab tshem tawm yog evaporated thiab qhuav ntawm qhov kub ntawm 103oC ~ 105oC, thiab ntsuas qhov loj ntawm cov khoom seem, uas yog cov khoom tawg. Dissolved solids muaj xws li inorganic ntsev thiab organic tshuaj yaj nyob rau hauv dej. Nws tuaj yeem kwv yees kwv yees los ntawm kev rho tawm cov khoom tshem tawm ntawm tag nrho cov khib nyiab. Cov chav tsev feem ntau yog mg / L.
Thaum cov dej phwj tuaj rov qab siv dua tom qab kev kho mob siab, nws cov khib nyiab yaj yuav tsum tau tswj nyob rau hauv ib qho chaw. Txwv tsis pub, yuav muaj qee qhov tsis zoo txawm tias nws yog siv rau kev cog qoob loo, kev tso dej hauv chav dej, ntxuav tsheb thiab lwm yam dej los yog ua dej hauv kev lag luam. Lub Tsev Haujlwm Saib Xyuas Kev Tsim Kho tus qauv "Water Quality Standard for Domestic Miscellaneous Water" CJ/T48-1999 qhia tias cov khoom yaj ntawm cov dej rov qab siv los siv rau kev cog qoob loo thiab kev tso dej hauv chav dej tsis tuaj yeem tshaj 1200 mg / L, thiab cov khoom tawg ntawm cov dej rov qab siv rau lub tsheb ntxuav thiab ntxuav tsis pub tshaj 1000 mg/L.
29.Dab tsi yog salinity thiab salinity ntawm dej?
Cov ntsiab lus salinity ntawm dej kuj hu ua salinity, uas sawv cev rau tag nrho cov ntsev uas muaj nyob hauv dej. Cov chav tsev feem ntau yog mg / L. Txij li cov ntsev hauv dej tag nrho muaj nyob rau hauv daim ntawv ntawm ions, cov ntsiab lus ntsev yog cov lej ntawm ntau yam anions thiab cations hauv dej.
Nws tuaj yeem pom los ntawm cov ntsiab lus hais tias cov dej yaj cov ntsiab lus ntawm cov dej muaj ntau dua li cov ntsev ntsev, vim tias cov kua dej yaj kuj muaj qee cov organic teeb meem. Thaum cov organic teeb meem cov ntsiab lus nyob rau hauv dej tsawg heev, yaj cov khib nyiab qee zaum siv tau los kwv yees cov ntsiab lus ntsev hauv dej.
30.Dab tsi yog qhov conductivity ntawm dej?
Conductivity yog reciprocal ntawm qhov tsis kam ntawm cov kua aqueous, thiab nws chav tsev yog μs / cm. Ntau cov ntsev ntsev hauv dej muaj nyob hauv lub xeev ionic, thiab cov ions no muaj peev xwm ua tau hluav taws xob. Cov ntsev ntau dua hauv dej, qhov ntau dua cov ntsiab lus ion, thiab cov dej conductivity ntau dua. Yog li ntawd, nyob ntawm seb qhov conductivity, nws tuaj yeem cuam tshuam ncaj qha rau tag nrho cov ntsev hauv dej los yog cov ntsiab lus yaj ntawm cov dej.
Lub conductivity ntawm cov dej tshiab distilled yog 0.5 mus rau 2 μs / cm, cov conductivity ntawm ultrapure dej yog tsawg tshaj li 0.1 μs / cm, thiab cov conductivity ntawm concentrated dej tawm los ntawm softened dej chaw nres tsheb yuav siab li ntau txhiab μs / cm.
Post lub sij hawm: Oct-08-2023
