Page 5 - 《水资源与水工程学报》2022年第4期
P. 5
!33 " ! 4 # & ' ( ) & * + , - Vol.33No.4
2022 $ 8 % JournalofWaterResources&WaterEngineering Aug.,2022
DOI:10.11705/j.issn.1672-643X.2022.04.01
/01234(56789:;<=>?@
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Concentrationpropertiesandhealthriskassessmentof
heavymetalsinLhasaRiver ,Tibet
2
1,2
1,2
QINHuanhuan ,GAOBai,SUNZhanxue
(1.StateKeyLaboratoryofNuclearResourcesandEnvironment,EastChinaUniversityofTechnology,Nanchang330013,China;
2.SchoolofWaterResourcesandEnvironmentalEngineering,EastChinaUniversityofTechnology,Nanchang330013,China)
Abstract:InordertoinvestigatethecontentofheavymetalsinLhasaRiver,watersampleswerecollect
edfrom16samplingpointsinthemiddleandlowerreachesofLhasaRiverandtheDuilonquTributaryin
July2017.Theconcentrationsoffiveheavymetals(As,Cd,Cu,ZnandMn)weremeasuredandthe
humanhealthriskscausedbytheseheavymetalsviadrinkingwaterwereevaluated.Theresultsshowthat
theconcentrationsofthesefiveheavymetalsinthewaterofthestudyareaareasfollows :Zn>Mn>Cu>
As>Cd ,whichdonotexceedthelimitvaluesspecifiedintheStandardsforDrinkingWaterQuality(GB
5749—2022).Moreover,thewaterqualityofthestudyareaalsomeetsclassIand Ⅱ standards(accord
ingtotheEnvironmentalQualityStandardsforSurfaceWater(GB3838—2002)).Thehighconcentra
tionsofAs,CuandMnareprimarilydistributedinthelowerreachesofLhasaRiverandthoseofZnare
inthemiddlereaches.Theresultsofhealthriskassessmentshowthatthehealthriskofchemicalcarcino
genheavymetalsismuchgreaterthanthatofnoncarcinogenheavymetals.Asistheleadingchemical
carcinogenheavymetalinLhasaRiver ,contributing71.1% ofthecarcinogenicrisk.Thehealthrisks
causedbyheavymetalsviadrinkingwateringestioninLhasaRiveraregenerallyatanacceptablesafety
level;however,childrenaremoresusceptiblethanadultstothesamehealthrisk,whichposesagreater
threattotheirhealth.Therefore ,stricterregulatorymeasuresareneededtomanagechildren’sdrinking
waterproblems.
Keywords:healthriskassessment;heavymetal;chemicalcarcinogen;noncarcinogen;LhasaRiver
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