C&EN READER
SERVICE VALID THROUGH MARCH 31, 1972
JAN . 31 ADVERTISED PRODUCTS 1 14 27 40 53 66
2 15 28 41 54 67
3 16 29 42 55 68
4 17 30 43 56 69
5 18 31 44 57 70
6 19 32 45 58 71
7 20 33 46 59 72
8 21 34 47 60 73
9 22 35 48 61 74
10 23 36 49 62 75
11 24 37 50 63 76
12 25 38 51 64 77
13 26 39 52 65 78
108 121 134 147 160 173
109 122 135 148 161 174
110 123 136 149 162 175
111 124 137 150 163 176
112 125 138 151 164 177
NEW PRODUCTS, NEW LITERATURE:
Cobratec could save you a pretty penny! Copper and copper alloys stay brighter longer when t r e a t e d with Cobratec, an aromatic triazole. Example: the bright half of the penny was dipped in 1 % Cobratec solution; both halves were exposed for 15 minutes in a c c e l e r a t e d test atmosphere. Cobratec provides both a mechanical and electrochemical shield that is chemically bonded to the metal. Cobratec c a n ' t wash off. Or wipe off. It adds protection in multimetal liquid handling systems by tying up free copper ions in solution which cause g a l v a n i c c o r r o s i o n in other metals; can be used alone
or in c o m b i n a t i o n with other c o m p o u n d s for both atmospheric or solution applications. C o b r a t e c p r o v i d e s better, longer l a s t i n g p r o t e c t i o n . . . your savings could add up to a pretty piece of change. Samples! Write SHERWIN W I L L I A M S CHEMICALS, P. O. Box 5638, C l e v e l a n d , Ohio 44101. Or call (216) 566-2960.
sherwin Williams chemicals
CIRCLE 6 ON READER SERVICE CARD
100 113 126 139 152 165
101 114 127 140 153 166
102 115 128 141 154 167
103 116 129 142 155 168
104 117 130 143 156 169
105 118 131 144 157 170
106 119 132 145 158 171
107 120 133 146 159 172
PLEASE CHECK YOUR FUNCTION: 1 • MANAGEMENT 2 • PRODUCTION, CONTROL 3 D PROCESS DESIGN & DEV.
4 • PRODUCT R&D 5 • PURCH., SERVICE, SLS. 6 • OTHER
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Determine pollutant metals with our Model 103 Atomic Absorption Spectrophotometer. AA spectrophotometry is increasingly used to determine metallic elements in waters, effluents, brines, impinged air samples, and other materials that can be dissolved or suspended. Our new Model 103 is easy to use and priced so low many laboratories can fully equip themselves for under $4,000. Yet, it includes many features formerly available only on very expensive instruments - i f at all. The 103 reads directly in concentration of the element. The zero-concentration reading is set by touching an auto-zero button. It includes integration, which improves precision while speeding up analyses. (You can determine one element in one sample in about ten seconds.) For details, write for our 16-page bulletin 'Techniques and Applications of Atomic Absorption." Instrument Division, Perkin-Elmer Corporation, 707 Main Avenue, Norwalk, Connecticut 06852.
PERKIN-ELMER CIRCLE 4 O N READER SERVICE CARD
