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Standard Test Method for Analysis of Phytoplankton in Surface Water by the Sedgwick-Rafter Method (Withdrawn 2020)
Automaticky přeložený název:
Standardní zkušební metoda pro analýzu fytoplanktonu v povrchových vod Sedgwick-Rafter metody
NORMA vydána dne 1.9.2012
Označení normy: ASTM D4148-82(2012)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.9.2012
Kód zboží: NS-26226
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
ICS Number Code 13.060.10 (Water of natural resources)
Significance and Use | ||||||||||
4.1 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. |
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1. Scope | ||||||||||
1.1 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 10× oculars the maximum overall magnification is approximately 250×. High concentrations of suspended sediment can obscure the algal cells, and thus cause interference. 1.2 This test method is applicable to both freshwater and marine samples. 1.3 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.
Standard Specification for Reagent
Water Standard Practices for Sampling Water
from Flowing Process Streams Standard Classification for Sampling
Phytoplankton in Surface Waters Standard Terminology Relating to Water
(Includes all amendments and changes 2/14/2024). |
Poslední aktualizace: 26.04.2024 (Počet položek: 2 896 057)
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