Photo du chimiste prend de l'eau pour examen dans l'étang - Photo & image de stock

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

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

Chemist with bulb and raised finger sits on river bank

Laboratory assistant with test tube in hand on river bank

Photography of environmentalist for examination takes water in reservoir

Ecologist with bulb and raised finger down on nature

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

Photo biologist takes water for examination in pond

Chemist on river bank with test tube and water in hands

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

Chemist in respirator with test-tube, thumb up, on blurred background

Ecologist with bulb and folder on river bank, blurred background

Ecologist with bulb writes in folder on banks of river, blurred background

Lab assistant with test tube, finger down, blurred background

Laboratory assistant with test tube, thumb up, blurred background

Laboratory assistant with bulb in hand on river bank in summer

Photo of hand in blue glove with test tube on blurred gray background