pH of ocean surface water is normally 7.5.to 8.5 pH.
Over the years however, acidification tendency is to decrease 0.1 to 0.2 pH units/century. Acidification is a consequence of carbon dioxide (CO₂) absorption in seawaters and oceans. Carbon dioxide reacts with seawater to produce carbonic acid (H₂CO₃).
pH modifications affect marine life growth, reproduction, and communication. Hydrogen ions have a tendency to bond with carbonate to form bicarbonate. The greater attraction to carbonate over calcium can adversely affect skeleton building and can limit coral growth.
|Range||6.3 to 8.6 pH|
|Accuracy @ 25°C/77°F||±0.2 pH|
|Light Source||LED @ 525 nm|
|Light Detector||silicon photocell|
|Method||colorimetric adaptation of phenol red method|
|Auto-off||after ten minutes of non-use|
|Environment||0 to 50°C (32 to 122°F); RH max 95% non-condensing|
|Battery Type||(1) 1.5V AAA|
|Ordering Information||HI-780 Checker HC is supplied with sample cuvettes with caps (2), pH reagent starter set, battery, and instructions|
|Accessories purchased separately||HI-780-25 Reagent set for approx. - 100 tests. HI-780-11 Calibration set|