Turbidity was measured using the nephelometric method with a 2100P HACH portable turbidimeter. |
Using distilled water, researchers prepared 1-liter suspensions of bentonite, kaolinite, and illite with turbidities of 50, 100, and 200 nephelometric turbidity units. |
Turbidity was measured in nephelometric turbidity units using the Hach 2100N turbidimeter. |