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Belfast Meeting. UMH Ángel Carbonell Francisco Burló Antonio Signes. Food Safety. SA3. Task “Estimation of daily dietary arsenic intake from water and foods”. Food Safety.

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Presentation Transcript
slide1

Belfast Meeting

UMH

Ángel Carbonell

Francisco Burló

Antonio Signes

slide2

Food Safety

SA3. Task “Estimation of daily dietary arsenic intake from water and foods”.

slide3

Food Safety

The agreement with RKVM is already signed and RKVM has appointed Ms. Kasturi Mitra, who has submitted her Ph.D. dissertation in March 2005 (Environmental Science).

RKVM has already sent rice samples and they have reached Alicante without any problems at the Spanish customs.

RKVM is preparing the plot at the site for plant growing using treated water.

Besides, samples of crops included in the following table are being collected and air-mail to Spain for analyses.

slide4

Food Safety

If possible, we will try to get samples from the same items before and after the monsoon to study the effect of this event on As concentration in the crops.

slide5

Food Safety

Food Habits Survey (Kasturi)  Estimation of As Intake  Evaluation of Risks

slide6

Fertilizers

SA3. Task “Effect of fertilizers such as phosphates on arsenic mobility in the soil”.

slide7

Fertilizers

Woolson (1975) concluded that:

Low levels of phosphorus added to an arsenic toxic soil will displace arsenic from soil particles to increase the toxicity to plants, but larger applications of phosphorus will compete at the root surface and decrease toxicity.

Carbonell-Barrachina et al. (1998) concluded that:

Since P can be substituted for As in plant, but is unable to carry out P’s role in energy transfer, the plant reacts as if there is a P deficiency. Thus, as plant As increases, the plant reacts by increasing both P and As uptake.

slide9

Anaerobic Soil

Aerobic Soil

Highly

Moderately

Reducing

Oxidizing

Reducing

Reducing

C Dioxide ---> Methane

Arsenate ---> Arsenite

Nitrate ---> Nitrogen

Oxygen ---> Water

Sulfate ---> Sulfur

Mn(IV) ---> Mn(II)

Fe(III) ---> Fe(II)

3

2

1

-300

-200

+400

-100

0

+100

+200

+300

Redox Potential (mV)

Fertilizers

slide10

Air

Air

Eh-meter

Nitrogen

Nitrogen

Anaerobic System

Intermediate Syst.

Aerobic System

Fertilizers

slide13

Fertilizers

Under oxidizing conditions, As will be eventually co-precipitated and became immobilized by formation of insoluble, hydrated iron oxides. Immobilization will also occur with other high surface-area compounds such as organic matter

slide14

Fertilizers

Under reducing conditions, sulfides play an important role in retaining As. A high availability of sulfur sources will help to reduce and keep to a minimum As solubility by precipitating arsenic as insoluble sulfides.

slide15

Belfast Meeting

UMH

Ángel Carbonell

Francisco Burló

Antonio Signes

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