Water Quality

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An icon representing the application of fertilizer on agricultural fields

Agricultural fertilizer icon

An icon representing the application of fertilizer on agricultural fields

Human - Agriculture
IAN Symbols

Agricultural fertilizer icon
Illustration for total nitrogen

Total nitrogen (TN)

Illustration for total nitrogen

Processes - Chemical
IAN Symbols

Total nitrogen (TN)
Illustration indicating total organic carbon (TOC)

Total organic carbon (TOC)

Illustration indicating total organic carbon (TOC)

Processes - Biological
IAN Symbols

Total organic carbon (TOC)
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