Ökológus, a kék kesztyű a kémcsőben a kezébe veszi a mintát víz közelében tó partján - Stock fotó és kép

Chemist on river bank with test tube and water in hands

Biologist with bulb in hand on river bank in summer

Laboratory assistant with bulb in hand on river bank in summer

Close-up, the terrorist in a protective suit and gloves, pours liquid with poison, for infection, in a drainpipe

Scientist or Biologist in a protective suit and protect mask collects sample of waste water from industrial for analyze, problem environment, Ecologist sampling water from the river with test tube

Chemist in respirator and blue gloves with test tube in hands takes sample of water near lake shore

Water pollution concept. Woman scientist takes a water sample from polluted pond.

Photography of environmentalist for examination takes water in reservoir

Laboratory assistant in respirator and blue gloves with test tube in hands takes sample of water near lake shore

Ecologist with test-tube and mask, protective suit, finger down, sits on river bank

Young environmentalist in protective suit takes water samples in river

Photo of ecologist in mask, protective suit with test tube, thumb up, on river bank

Ecologist looks at flask with water sitting on river bank

Photo of chemist takes water for examination in pond

Biologist with test tube in mask, protective suit, finger down, sits on river bank

Photo ecologist from back and in protective suit with flask with water in hands on river bank

Chemist looks at flask with water sitting on river bank