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
Specifications
Specifications list
Specifications
| Range | 6.3 to 8.6 pH | |
| Resolution | 0.1 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 |