Chemical Characteristics of Rainwater in Sumatera, Indonesia, during 2001–2010
Table 1
Rainfall, pH (rainwater acidity), comparative ratio between annual depositions of /(nss- + ) with nss- and /( + ) with , and also comparative ratio between depositions of Na+ with Cl−. Unit of the ion depositions in meq⋅m−2⋅y−1.
Location
Year
Rainfall (mm)
/(nss- + )
/( + )
pH
Cl−/Na+
Kototabang
2001
1209
0.24
0.54
5.16
1.46
2002
1798
0.28
0.73
5.56
2.66
2003
3127
0.44
0.98
5.39
2.88
2004
2405
0.30
0.31
4.83
1.32
2005
2287
0.13
0.14
4.73
1.27
2006
1248
0.32
0.31
4.62
0.38
2007
3430
0.23
0.13
5.33
1.30
2008
2481
0.35
0.27
5.33
0.73
2009
2656
0.03
0.09
4.73
1.75
2010
2064
0.14
0.43
4.97
1.33
Medan
2001
2106
0.53
0.33
4.63
1.59
2002
1342
0.45
0.62
5.09
2.77
2003
1765
0.37
1.00
5.29
3.97
2004
345
0.39
0.65
5.81
1.95
2005
2006
2007
528
0.40
0.53
5.17
1.54
2008
645
0.30
0.44
5.20
1.13
2009
1239
0.35
0.39
5.03
1.62
2010
1209
0.34
0.36
5.30
1.15
Lampung
2001
452
0.44
0.23
4.52
1.35
2002
529
0.43
0.88
5.63
1.39
2003
1453
0.30
0.90
4.89
2.43
2004
2005
2006
2007
757
0.38
0.37
5.68
1.29
2008
630
0.41
0.19
5.98
0.78
2009
1821
0.33
0.25
5.39
1.03
2010
2390
0.35
0.26
5.55
0.96
Palembang
2001
2100
0.39
0.17
5.39
1.16
2002
1701
0.33
0.25
4.75
1.88
2003
2004
1566
0.23
0.14
5.19
1.11
2005
2004
0.31
0.18
5.02
1.37
2006
1654
0.24
0.19
4.73
1.69
2007
2267
0.34
0.22
5.59
2.03
2008
1153
0.34
0.11
5.75
0.95
2009
2317
0.18
0.13
5.60
1.78
2010
3470
0.29
0.14
5.49
1.07
Note: : no sampling of rainwater in Medan, Palembang, and Lampung.