CONTAMINATION SURFACE C1 C2 AVG. COUNT COUNT/SEC.

AFTER CONTAMINATION

GLASS 1977 1886 1931.50 76.85WOODEN 2456 2482 2469.00 98.35ROUGH SURFACE 2207 2178 2192.50 87.34PLATE (LINOLINE COATED) 2201 2347 2274.00 90.57TILE 946 940 943.00 37.43

AFTER WASHING WITH WATER

GLASS 1009 1047 1028.00 40.71WOODEN 2106 1870 1988.00 79.11ROUGH SURFACE 1898 1930 1914.00 76.20PLATE (LINOLINE COATED) 1339 1433 1386.00 55.05TILE 819 753 786.00 31.15

AFTER WASHING WITH DETERGENT SOLUTION

GLASS 986 971 978.50 38.73WOODEN 1749 1569 1659.00 65.95ROUGH SURFACE 1690 1487 1588.50 63.18PLATE (LINOLINE COATED) 1025 959 992.00 39.29TILE 419 376 397.50 15.61

AFTER WASHING WITH 2 N HCl SOLUTION

GLASS 336 278 307.00 11.87WOODEN 1519 1567 1543.00 61.31ROUGH SURFACE 1332 1331 1331.50 52.90PLATE (LINOLINE COATED) 418 424 421.00 16.45TILE 74 33 53.50 1.85

AFTER WASHING WITH ACETONE

GLASS 262 249 255.50 9.81WOODEN 1255 1296 1275.50 50.61ROUGH SURFACE 1201 1270 1235.50 49.06PLATE (LINOLINE COATED) 265 249 257.00 9.89TILE 68 49 58.50 2.05

OBSERVATION