,".'.d(P: - Higher Education Commission

studies also indicate thar PCBS d€ 6s@iared wilh cocs of the liver dd biliary
i. hmN lN*nisni.rd snk.arrlu, l9ll.
1.2.2 Inorgrnic.otrtrbirs.tt
T@. oebls e tho* common polludts thal e g.rebllt distribul€d in the
etrvnoment {ith souc6 nostly noh $. w.alheri.s of oioerals dd soih. It the past
decades, humd iopu$ and aclivities lead lo i@ense incease in the lcvel of traoe netals
in th. dvircmcnt. Heavy mdab cd otcr a water supply by i.dusti.l &d consmer
s6L, malerials u€d d plmbing syst€h dd &om midic Bin bealdne dom soil ed
elcasing healy melals ilto slreds, laLs, rivers dd groundwater Healy netrls tcnd to
bio&cuula,Ie dd ale €u* s.io6 heahh etr€cL ilcluding r€duced 8m$1h &d
development, orgd ddasq n.ruou systcm danase. cdcr dd in sere css dal
caups dealh. Most oflhen.ho have a great affinny fot sultur ed attack sultur bolds in
erzlmes, thd imnobilitng the.nz.mes. Polein ceboxylic acid GCO:rD od dino {_
NH, sroups e ale chedicauy boud by heaia hetah. The m4jor isks to hume
health fron heavy melals re linlcd wilh exposue to codmim (Cd), lead (Pb), m.rcury
(Hs) dd senjc (At F!rup, 20031. cadmiu (cd), lead (Pb), @ppd (cu) md mercur,
(Hd io6 bind lo ell nembdcs md hird.r tne l'dspon Foccas.s $rcugh tlE ell
wall. Heavy n.lds my also pEcipiiat€ phosphate bioconpou.ds or cahlyzc ther
Som. of the mcialloids d€ abo signifi@l walr polluldls lik€ d.nic (A9. slenim
(Se) md etimony (Sb) As.lic b introduced inlo uler through lhe ahosFhenc
d.posnion, dis$lurion of minerals dd oes &d non indutrid .muenb
EpidcFiological $udies har. suggest€d that 6enic in dinking waicr poPs substlntial
risksof l$g,bladdcr,skinedkidney cmcer{Bofieit.. Nyberg. 2003l.
C-vdides (CN) e ocGiomlly foud in dri.thne wr.t bul its prc*nce is m indicaror of
a s.rios pouulion pobl€n. which h plineily 6 a conscquence of indusdal
Hi8n€r concmtrarioN of nuodde (F) e t€quddy @iat d with und.rgrcund
surces. Fluondes may ?nso eot ! a dver 6 a rcsult of indusrial di$harges Fluoide is