Which of the following can be considered nutrients that may contaminate water?

Phosphates are indeed classified as nutrients that can contaminate water, particularly in the context of environmental health. They are commonly found in certain fertilizers, detergents, and agricultural runoff. When phosphates enter water bodies, they can contribute to nutrient pollution, which may lead to algal blooms. These blooms can deplete oxygen levels in the water and harm aquatic life, a process known as eutrophication.

In contrast, other substances mentioned can be harmful but do not primarily function as nutrients. Chlorine is widely used as a disinfectant in water treatment and is not considered a nutrient itself. Metals, such as lead or mercury, can be toxic and contaminate water, but they do not provide nutritional benefits. Microorganisms include bacteria, viruses, and parasites, which can cause health issues but are not classified as nutrients.

Understanding the role of phosphates as nutrients that can contaminate water highlights the importance of monitoring nutrient levels in environmental health and water quality management.