| A | B |
|---|
| oxygen level needed for trout | 7 mg/l |
| nitrate level in lakes needs to below this number to prevent eutrophication | .3 mg/l |
| phosphate levels should be below this number in lakes to prevent eutrophication | .015 mg/l |
| hard water is any value over this number | 180 mg/l |
| less than this alkalinity value will cause pH changes when acid rain occurs | 50 mg/l |
| the test which measures thes waters ability to neutralize acids | alkalinity |
| these are nutrients to phytoplankton | phosphates and nitrates |
| nutrient that can enter water with erosion | phosphates |
| a neutral pH | 7 |
| reason oxygen levels higher in upper waters of a lake | photosynthesis |
| measures the transparency of water | turbidity test |
| ammonia levels above this value will harm some aquatic organisms | .5 mg/l |
| area in lake where photosynthesis can occur | top of lake, light present |
| area of lake that would have highest carbon dioxide levels | bottom of lake |
| phosphates are the limiting factor for | algae growth |
| source of nitrates in water | manure |
| area of grass planted along stream or drainage ditch to absorb nutrient run-off | buffer strip, raparian zone |
| amount of calcium and magnesium in water | hardness |
| aerobic bacteria | require oxygen |
| anaerobic bacteria | live without oxygen |
| pH that supports most life | 6.7-8-4 |
| amount of oxygen that can be found in water at specific temperature | % saturation |
| compensation depth | where oxygen used is same as oxygen made |
| without waste treatment, this test would be low in the MN river | dissolved oxygen |
| nitrates and phosphates | levels of these will increase rate of eutrophication |
| if excessive in drinking water, causes heart defects | nitrates |
| problem with MN river water | excessive sediment |
| mercury going down drain would end up where? | MN river or farmers field |
| New tank as wastewater plant removes | phosphorous |
| When sediment levels are high, this test result will be high | turbidity |
| If water temp. goes up, amount of dissolved oxygen goes ___ | down |
| no phosphorous is now permitted in | lawn fertilizer |
| acceptable phosphate levels in flowing water | .25 mg/l |
| low % oxygen saturation indicates | excessive decomposition |
| water + carbon dioxide makes ______ that ______ the waters pH | carbonic acid; lowers |
| soaps in sewage make the pH more ____ | basic |
| below this conductivity level, water is unproductive | 50 |
| dissolved oxygen level that supports good diversity of life | 5 mg/l |
| this type of fish can live in low oxygen | rough fish like carp, bullheads |
