ASTM D4148-1982(2012)
用塞奇威克椽法(Sedgwick-Rafter)分析地表水中可繁殖浮游植物的标准试验方法已作废

Standard Test Method for Analysis of Phytoplankton in Surface Water by the Sedgwick-Rafter Method

标准号

ASTM D4148-1982(2012)

发布日期

1982年

实施日期

废止日期

2020-05-13

中国标准分类号

C51

国际标准分类号

13.060.10

发布单位

美国材料与试验协会

代替标准

No Replacement

适用范围

4.1x00a0;Phytoplankton are basic to the food chain in all aquatic environments. In addition, they have long been considered to be important indicators of water-quality conditions. Phytoplankton data are also frequently used in the planning and design of water-treatment facilities and reservoirs.

1.1x00a0;This test method covers determining the density and taxonomic classification of phytoplankton. It is applicable both to relatively sparse or dense phytoplankton concentrations, provided the suspended-sediment concentration is low. The Sedgwick Rafter (S-R) method requires less costly apparatus than does the inverted microscope method but gives less accurate results. The inherent inaccuracy in the Sedgwick-Rafter method is due to the design of the counting chamber and cannot be circumvented by a different choice of optics. For this reason, the S-R method is limited to the use of objective lenses having a working distance of approximately 1.6 mm or more. With 10x00d7; oculars the maximum overall magnification is approximately 250x00d7;. High concentrations of suspended sediment can obscure the algal cells, and thus cause interference.

1.2x00a0;This test method is applicable to both freshwater and marine samples.

1.3x00a0;This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary information see Section 8.