Thames & Kosmos Glowing Chemistry handleiding

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Thames & Kosmos

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Handleiding

EXPERIMENT 19

Blood test

Sometimes, it’s the FBI’s task to search for

tiny splatters of blood at the scene of a crime.

Luminol can be helpful here, and is in fact used

for this task.

YOU WILL NEED

› Safety goggles

› Luminol

› Sodium carbonate

› Test tube

› Pipette

› Double-headed measuring spoon

› Petri dish

› Hydrogen peroxide

› Paper towel

› Fresh piece of meat or hamburger meat

HERE’S HOW

1. In the kitchen, drip some blood from a piece

of fresh meat onto a strip of paper towel, or

press a pea-sized piece of hamburger meat

onto the paper. Wash your hands afterwards!

2. Prepare some more light solution as in

Experiment 17.

3. Lay the blood-smeared paper towel onto the

lid of the Petri dish.

4. Make the room completely dark, switch on

the red light, and wait a few minutes for your

eyes to get used to the dimness. Then, use the

pipette to drip the light solution onto the

paper towel and immediately turn off the red

light.

After the experiment, dispose of the paper

towel in the garbage.

Light Solution

Mysterious Glow

WHAT’S HAPPENING

The spots that were smeared with blood

glow a brighter blue than the area

around them. The reason? Blood

contains a red pigment called

hemoglobin, which is a very complex

chemical compound that contains

iron. The test also works, by the way,

after the blood has been drying for

several days.

Sodium

carbonate

Hydrogen

peroxide

Luminol

Light Solution

Water

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