Table 4.3 Summary Statistics of
2002 Marine Water Quality in the Vicinity of the Macau Ferry Terminal
|
Parameter |
|
EPD Monitoring Station |
WPCO
WQOs (in marine waters) |
||
|
VM5 |
VM6 |
VM7 |
|||
|
Temperature (oC) |
|
23.1 (16.3 - 27.4) |
23.1 (16.3 - 27.4) |
23.2 (16.4 - 27.5) |
Not more than 2 oC in daily
temperature range |
|
Salinity (ppt) |
|
31.8 (29.1 - 33.3) |
31.8 (28.7 - 33.2) |
31.7 (28.7 - 33.2) |
Not to cause more than 10% change |
|
Dissolved Oxygen (DO) (% saturation) |
|
81.0 (65 – 104) |
77.0 (67.0 – 92.0) |
79.0 (68.0 – 103.0) |
- |
|
Bottom |
73.0 (34 – 103) |
69.0 (20.0 – 89.0) |
71.0 (47.0 – 85.0) |
- |
|
|
DO (mg/L) |
|
5.7 (4.6 – 6.9) |
5.5 (4.7 – 6.3) |
5.6 (4.6 – 7.0) |
Not below 4 mg/L for
90% of the samples |
|
Bottom |
5.2 (2.4 – 6.8) |
4.9 (1.4 – 6.3) |
5.1 (3.3 – 6.4) |
Not below 2 mg/L for
90% of the samples |
|
|
pH value |
|
8.0 (7.6 – 8.2) |
7.9 (7.7 – 8.2) |
7.9 (7.6 – 8.3) |
6.5 - 8.5 (± 0.2 from natural range) |
|
Secchi disc (m) |
|
2.0 (1.0 – 3.0) |
1.9 (1.0 – 2.5) |
1.7 (1.0 – 3.0) |
- |
|
Turbidity (NTU) |
|
10 (7.0 - 14.3) |
10.4 (7.0 – 14.6) |
10.2 (7.3 – 15.6) |
- |
|
Suspended Solids (SS) (mg/L) |
|
6.0 (3.2 – 13.3) |
7.0 (3.4 – 17.0) |
6.0 (3.9 – 10.1) |
Not more than 30% increase |
|
Silica (as SiO2) (mg/L) |
|
0.7 (0.1 – 1.4) |
0.7 (0.2 – 1.4) |
0.7 (0.3 – 1.3) |
- |
|
5-day Biochemical Oxygen
Demand (BOD5) (mg/L) |
|
1.2 (0.5 – 2.4) |
1.2 (0.7 – 2.3) |
1.3 (0.5 – 3.1) |
- |
|
Nitrite Nitrogen (NO2-N) (mg/L) |
|
0.03 (0.01 – 0.05) |
0.03 (0.01 – 0.05) |
0.03 (0.01 – 0.05) |
- |
|
Nitrate Nitrogen (NO3-N)
(mg/L) |
|
0.10 (0.04 – 0.17) |
0.10 (0.04 – 0.21) |
0.11 (0.06 – 0.21) |
- |
|
Ammonia Nitrogen (NH3-N)
(mg/L) |
|
0.19 (0.05 – 0.42) |
0.20 (0.06 – 0.42) |
0.21 (0.06 – 0.41) |
- |
|
Unionised Ammonia (UIA) (mg/L) |
|
0.006 (0.003 – 0.010) |
0.006 (0.003 – 0.010) |
0.007 (0.003 – 0.011) |
Not more than annual
average of 0.021 mg/L |
|
Total Inorganic Nitrogen
(TIN) (mg/L) |
|
0.31 (0.13 – 0.64) |
0.33 (0.20 – 0.65) |
0.34 (0.20 – 0.66) |
Not more than annual water
column average of 0.4 mg/L |
|
Total Nitrogen (Total-N) (mg/L) |
|
0.52 (0.30 – 0.90) |
0.53 (0.36 – 0.84) |
0.54 (0.46 – 0.87) |
- |
|
Ortho-Phosphate (Ortho-P)
(mg/L) |
|
0.022 (0.007 – 0.040) |
0.023 (0.009 – 0.040) |
0.023 (0.009 – 0.038) |
- |
|
Total Phosphorus (Total-P)
(mg/L) |
|
0.05 (0.03 – 0.08) |
0.05 (0.03 – 0.07) |
0.05 (0.04 – 0.07) |
- |
|
Chlorophyll-a (µg/L) |
|
4.8 (0.6 – 18.9) |
4.2 (0.4 – 16.2) |
4.2 (0.7 – 19.8) |
- |
|
E. coli (cfu/100 mL) |
|
4,500 (630 – 42,000) |
5,000 (600 – 19,000) |
4,600 (1,500 – 60,000) |
- |
|
Faecal Coliform (cfu/100 mL) |
|
11,000 (1,400 – 70,000) |
13,000 (2,000 – 70,000) |
12,000 (4,100–180,000) |
- |
Note: 1. Except as specified, data presented are
depth-averaged values calculated by taking the means of three depths: Surface,
mid-depth, bottom.
2. Data presented are annual arithmetic means of
depth-averaged results except for E. coli
and faecal coliforms that are annual geometric means.
3. Data in brackets indicate the ranges.