International Scholarly Research Notices

Research Article

Regional Analysis on Decadal Variation in Aspects of Water Quality in Three Contrasting Coastal Systems of Ishikawa Coast, Japan

Table 1

Mean ± SD of some water quality parameters at KNA, NTA, and NNA areas on Ishikawa coast.


Area	Parameters	1984	1989	1994	1999	2004	2009

	Temperature (°C)	16.90 ± 8.1^a	17.77 ± 7.50^a	19.08 ± 9.00^a	18.66 ± 7.80^a	18.95 ± 8.60^a	19.00 ± 6.10^a
	T-N (mg/L)	0.98 ± 0.20^a	0.88 ± 0.20^a	0.79 ± 0.10^a	0.69 ± 0.30^a	0.74 ± 0.20^a	0.65 ± 0.30^a
KNA	T-P (mg/L)	0.09 ± 0.00^b	0.10 ± 0.00^b	0.07 ± 0.00^a	0.05 ± 0.00^a	0.07 ± 0.00^a	0.05 ± 0.00^a
KNA	DO (mg/L)	8.05 ± 0.36^b	7.87 ± 0.34^a	8.22 ± 0.16^b	8.60 ± 0.22^c	9.22 ± 0.24^e	9.01 ± 0.24^d
	pH	8.43 ± 0.09^c	8.33 ± 0.07^b	8.31 ± 0.07^b	8.33 ± 0.06^b	8.30 ± 0.07^b	8.25 ± 0.08^a
	COD (mg/L)	1.90 ± 0.63^b	1.38 ± 0.44^a	1.68 ± 0.64^a,b	1.58 ± 0.38^a,b	1.60 ± 0.47^a,b	1.54 ± 0.37^a

	DO (mg/L)	9.78 ± 0.62^d	7.76 ± 0.28^a	8.32 ± 0.25^b	8.86 ± 0.27^b,c	9.16 ± 0.23^c	8.74 ± 0.12^b,c
NTA	pH	8.40 ± 0.12^c	8.30 ± 0.00^b	8.30 ± 0.00^b	8.38 ± 0.05^b,c	8.30 ± 0.00^b	8.20 ± 0.07^a
	COD (mg/L)	1.00 ± 0.50^a	1.10 ± 0.07^a	1.12 ± 0.13^a	1.36 ± 0.13^a	1.28 ± 0.18^a	1.32 ± 0.34^a

	Temperature (°C)	20.20 ± 8.16^a	22.22 ± 3.98^a	19.62 ± 7.35^a	21.20 ± 7.72^a	19.11 ± 6.38^a	18.36 ± 7.00^a
	T-N (mg/L)	0.28 ± 0.13^a	0.17 ± 0.04^a	0.21 ± 0.04^a	0.29 ± 0.27^a	0.26 ± 0.06^a	0.23 ± 0.06^a
NNA	T-P (mg/L)	0.02 ± 0.01^a	0.03 ± 0.03^a	0.02 ± 0.01^a	0.03 ± 0.03^a	0.05 ± 0.11^a	0.02 ± 0.01^a
NNA	DO (mg/L)	8.63 ± 0.63^b,c	8.02 ± 0.14^a	8.41 ± 0.16^b	8.81 ± 0.30^b,c	8.89 ± 0.24^c	8.70 ± 0.25^b,c
	pH	8.37 ± 0.13^c	8.34 ± 0.05^b,c	8.27 ± 0.05^a,b	8.37 ± 0.05^c	8.29 ± 0.04^a,b	8.24 ± 0.05^a
	COD (mg/L)	1.35 ± 0.77^a	1.31 ± 0.24^a	1.29 ± 0.20^a	1.51 ± 0.20^a	1.61 ± 0.07^a	1.19 ± 0.32^a

Values of respective area and year along the same row bearing the same superscripts are not statistically different at 5% probability level using the Duncan multiple range test. For each area and year, data (except for T-N and T-P) were pooled from sampling stations ( size, 30–33) and months ( size, 10–12), respectively, to obtain the mean ± SD. Sea water temperature, T-N, and T-P data were not available for NTA.