The security of heavy metals in the mudfult soil

Wang Li

Environmental Science

Content

• Materials

• Method

• Anticipated result

Materials: 1 Mudflat soil from Rudong 2 Sludge from Tangwang sewage treatment plant 3 Sorghum sudanense

What is sorghum sudanense

• It is an annual herb belongs to Gramineae sorghum

• A species of grass raised for forage and grain

• Native to tropical and subtropical regions of Eastern Africa.

Why is sorghum sudanense

• Salt- resistant plants

• Drought-enduring plants

• The vegetative cycle of sorghum sudanense is very short

Method:1 Mixed mudflat soil with sludge in different

proportion: 0% 5% 10% 15% 20%

2 Plant sorghum sudanense in the mixture

3 When the sorghum sudanense ripe ,we will

test heavy metal(Cd Cr Cu Ni Pb Zn)in its

body.

Laboratory instrument

Atomic Absorption Spectroscopy(AAS)

Data processing

Absorbance

concentration

Standard

curve

A

?

Content(metal)=C*V/mIllustration:C:concentration V:the volume of the leaching liquorm:mass of the soil or plants

Anticipated resultThe heavy metals in sorghum sudanense plant in

the mudflat soil which mixed with sludge can meet the plant in vivo heavy metal content requirements