Heavy Metals as Toxicants in Big Cities

Heavy Metals (HMs) can have harmful effects on human health and on the environment. Their ecotoxicological properties are generally well known. As regards human toxicology, new aspects should be taken into consideration – gender and age dependence. We can estimate the HMs chemical risk and in this context, city demography data help to evaluate today's ecological situation (including HMs) and to predict the dynamics of future urbanization.

As regards urban atmosphere, motor vehicles (Pb) and industry (V, Ni, Cr, Cd) exert the greatest influence; water, soil, vegetation also experience menace caused by HMs. We should protect urban environments against contamination which is posed by HMs; the health status of big cities is dependent on adequate and safe supply of water. Vegetation plays a helpful role if we want to reduce HMs content in the atmosphere and the soil. Awareness of the inhabitants regarding the risks that are posed by HMs also counts as a critical factor today. Ecoeducation at the beginning of the new century can be taken into consideration.

Appendix 3

Tapescripts

Tapescript № 1 (to ex. 1.21, 1.22)

Why I love this city

Anna, a teacher from the USA

My parents are from Dublin. It's on the east coast of Ireland, near the sea. The River Liffey runs through the city. There are a lot of beautiful bridges, parks and elegant grey houses in this small and very old city.

The people are kind and friendly. You can meet them in cafes and have delicious Irish coffee (hot coffee, brown sugar, Irish whiskey - with an e! - and cream on the top). Dublin is also famous all over the world for its beer. Guinness is a black beer with a white creamy 'head'. There are a thousand pubs in Dublin. It's also famous for music, dance and poetry. Bob Geldof, Sinead O'Connor, U2, Oscar Wilde, George Bernard Shaw and James Joyce are all Dubliners.

Tapescript № 2 (to ex. 1.33, 1.34)

Dialogues

a. A: Excuse me! Is there a chemist's near here?

В: It's over there.

A: Thanks.

b. A: Excuse me! Is there a spot's club near here?

B: Yes. It's in Queen Street. Take the second street right.

A: Thanks,

c. A: Excuse me! Is there a newsagents' near here?

B: Yes. There is one in Church Street next to the bank and there is one

in Park Lane opposite the swimming pool.

A: Is that one far?

B: No. Just two minutes, that is all.

d. A: Is there a cinema near here?

B: Take the first left, and it's on the left, opposite the flower shop.

A: Thanks a lot.

Module III

Science, Technology and Outstanding People
in the Field

Unit 1

Science and Technology

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