Читать книгу Standard methods for the examination of water and sewage - Association of Official Agricultural Chemists - Страница 16

COMPARISON WITH NESSLER STANDARDS.

Оглавление

Inasmuch as the Nessler scale[62] and the natural water scale[22][49] which agrees with it except for colors less than 20, have been largely used in the past, the old results may be converted[117] into terms of the platinum standard by means of the ratios in Table 3, but they must not be considered as universally applicable as the variable sensitiveness of the Nessler solution introduces an uncertain factor.

Table 3.—Values for converting colors by the natural water scale into colors by the platinum standard in parts per million.[B]
Modified Nessler or natural water standard. 0.00. 0.01. 0.02. 0.03. 0.04. 0.05. 0.06. 0.07. 0.08. 0.09.
Platinum-cobalt standard color.
0.00 0 2 4 6 8 9 11 13 15 17
.10 18 19 20 20 21 22 23 24 24 26
.20 26 27 27 28 29 29 30 31 32 32
.30 33 34 34 35 35 36 37 37 38 38
.40 39 40 40 41 42 42 43 44 45 45
.50 46 47 47 48 48 49 50 50 51 51
.60 52 53 53 54 54 55 56 56 57 57
.70 58 58 59 59 60 60 61 61 62 62
.80 63 64 64 65 66 66 67 68 69 69
.90 70 71 72 73 74 75 77 78 79 80
1.00 81 82 82 83 84 84 85 86 87 87
1.10 88 89 89 90 91 91 92 93 94 94
1.20 95 96 96 97 98 98 99 100 101 101
1.30 102 103 103 104 105 105 106 107 108 108
1.40 109 110 110 111 112 112 113 114 115 115
1.50 116 117 117 118 118 119 120 120 121 121
1.60 122 123 123 124 125 125 126 127 128 128
1.70 129 130 130 131 132 132 133 134 135 136
1.80 136 137 137 138 139 139 140 141 142 142
1.90 143 144 144 145 146 146 147 148 149 149
2.00 150

B. Zero on the true Nessler scale is about 15 on the platinum scale.

Standard methods for the examination of water and sewage

Подняться наверх