水平板计数琼脂 英文名称: Water Plate Count Agar | ||||||||||||||||||
型号:null 产品货号: CM1012 | ||||||||||||||||||
价格:请致电:010-57128832,18610462672 | ||||||||||||||||||
品牌: 英国 | ||||||||||||||||||
WATER PLATE COUNT AGAR (ISO) CODE: CM1012 A medium for the enumeration of culturable micro-organisms from water using a colony count technique.
* Adjusted as required to meet performance standardsDirections Description Waters of all kinds invariably contain a variety of micro-organisms derived from various sources, such as soil and vegetation. Estimation of the overall numbers provides useful information for the assessment and surveillance of water quality. Separate counts are usually made of the micro-organisms which are able to grow and form colonies on nutrient agar media at 36°C and 22°C. Colony counts are useful for assessing the integrity of ground water sources and the efficiency of water treatment processes such as coagulation, filtration and disinfection and provide an indication of the cleanliness and integrity of the distribution system. They can also be used to assess the suitability of a water supply for the preparation of food and drink to avoid contaminating the product with spoilage organisms. The main value of colony counts lies in the detection of changes from expected counts, based on frequent, long term monitoring. Any sudden increase in the count can be an early warning of serious pollution and a call for immediate investigation1. Technique The time between addition of the test sample (or its dilution) and the addition of the molten medium shall not exceed 15 minutes. Inoculate at least one plate for incubation at each temperature. Invert the plates and incubate one set at 36°C ± 2°C for 44 ± 4 hours. Incubate the other set at 22°C ± 2°C for 68 ± 4 hours. Examine the plates immediately after incubation. If this is not possible refrigerate the plates and examine within 48 hours. Reject any plate with confluent growth. Storage conditions and Shelf Life Appearance Quality control
|