Ένας άντρας με προστατευτική στολή στέκεται σε ένα ποτάμι και ρίχνει νερό από ένα δοκιμαστικό σωλήνα μέσα του με αντιδραστήριο για να αναλύσει το επίπεδο ρύπανσης - Φωτογραφίες & Εικόνες Αρχείου

Hand in protective clothing and a rubber glove draws water into a flask from a river for chemical analysis

Environmental laboratory specialist in protective suit and mask in a gutter pours water into a flask to study the level of pollution, close-up

Lab worker in protective suit takes water from a river for further analysis

A man in a protective suit and gloves draws water from a stream using a pipette and a flask, close-up

Scientist, in a protective suit and mask, collects water from the river for testing, in test tubes

Terrorist in a protective suit and gloves, pours liquid from a glass tube with poison, for infection, in reservoirs

An environmental laboratory specialist in a protective suit takes a sample of soil from the river bottom with tweezers for research, close-up

Hand of a laboratory assistant in a rubber glove holds a test tube with water taken for analysis

Hand in glove collects water in a test tube.

A man in a protective suit takes soil samples into a Petri dish from treatment facilities, close-up

A man in a protective suit holds a Petri dish with a sample for plants and looks at the reaction in it after adding the reagent, top view

Close-up of a Petri dish with a sample of plants from a pond for research in the hands of a laboratory worker, top view

Close-up of a Petri dish with a sample of plants from a pond for research in the hands of a laboratory worker, top view, on a background of water

Close-up of a Petri dish with a sample of plants from a river into which a reagent for express research is poured from a test tube

A man in a protective suit holds a test tube in his hands with a green reagent for conducting water analysis against the background of the river

Side view of a man in a protective suit and mask holding a test tube and a pipette with test water on the river after an outdoor accident

Environmental biologist in a protective suit and mask examines water from the river for viruses