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Turbidity

Turbidity. Measure of relative sample clarity How much light is scattered by suspended particles. Turbidity Measurements. Slow-moving, deep waters Secchi disk Rule of Thumb: light penetrates 2-3x Secchi depth. Turbidity Measurements. Fast-moving, shallow water Turbidimeter (Nephelometer)

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Turbidity

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  1. Turbidity • Measure of relative sample clarity • How much light is scattered by suspended particles

  2. Turbidity Measurements • Slow-moving, deep waters • Secchi disk • Rule of Thumb: light penetrates 2-3x Secchi depth

  3. Turbidity Measurements • Fast-moving, shallow water • Turbidimeter (Nephelometer) • Nephelometric Turbidity Units (NTU’s)

  4. NC Waters • Average NTU’s • Salt ~ 25 • Fresh ~ 50 • Trout Water ~ 10 http://h2o.enr.state.nc.us/

  5. Factors Affecting Turbidity • High Flow Rate • Soil Erosion • Urban Runoff • Wastewater & Septic System Effluent • Decaying plants & animals • Bottom feeding fish • Algal blooms • Flooding

  6. Before After Millipore Vacuum Filtration Apparatus

  7.     Sample   #     Filter    #     Tare         Gross         Net     Corrected   Net     Liters    Filtered     TSS    [mg/L] 1 2 3 4 Blank 1 6 Blank 2 7 Blank 3 8 Avg. blank change Blank Correction Example Data Table:

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