ASTM D7315-07a
(Test Method)Standard Test Method for Determination of Turbidity Above 1 Turbidity Unit (TU) in Static Mode
Standard Test Method for Determination of Turbidity Above 1 Turbidity Unit (TU) in Static Mode
SCOPE
1.1 This test method covers the static determination of turbidity in water. Static refers to a sample that is removed from its source and tested in an isolated instrument. (See Section .)
1.2 This test method is applicable to the measurement of turbidities greater than 1.0 turbidity unit (TU). The upper end of the measurement range was left undefined because different technologies described in this test method can cover very different ranges. The round robin study covered the range of 0-4000 turbidity units because instrument verification in this range can typically be covered by standards that can be consistently reproduced.
1.3 Many of the turbidity units and instrument designs covered in this test method are numerically equivalent in calibration when a common calibration standard is applied across those designs listed in . Measurement of a common calibration standard of a defined value will also produce equivalent results across these technologies.
1.3.1 In this test method calibration standards are often defined in NTU values, but the other assigned turbidity units, such as those in are equivalent. For example, a 1 NTU formazin standard is also a 1 FNU, a 1 FAU, a 1 BU, and so forth.
1.4 This test method does not purport to cover all available technologies for high-level turbidity measurement.
1.5 This test method was tested on different natural waters and wastewater, and with standards that will serve as surrogates to samples. It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
1.6 Depending on the constituents within a high-level sample, the proposed sample preparation and measurement methods may or may not be applicable. Those samples with the highest particle densities typically prove to be the most difficult to measure. In these cases, and alternative measurement method such as the process monitoring method can be considered.
This standard does not purport to address all of the safety concerns, 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. Refer to the MSDSs for all chemicals used in this procedure.
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Designation: D7315 − 07a
StandardTest Method for
Determination of Turbidity Above 1 Turbidity Unit (TU) in
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Static Mode
This standard is issued under the fixed designation D7315; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope to measure. In these cases, and alternative measurement
method such as the process monitoring method can be consid-
1.1 This test method covers the static determination of
ered.
turbidity in water. Static refers to a sample that is removed
from its source and tested in an isolated instrument. (See
1.7 This standard does not purport to address all of the
Section 4.)
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
1.2 This test method is applicable to the measurement of
priate safety and health practices and determine the applica-
turbidities greater than 1.0 turbidity unit (TU). The upper end
bility of regulatory limitations prior to use. Refer to the MSDSs
of the measurement range was left undefined because different
for all chemicals used in this procedure.
technologies described in this test method can cover very
different ranges. The round robin study covered the range of
2. Referenced Documents
0–4000 turbidity units because instrument verification in this
range can typically be covered by standards that can be
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2.1 ASTM Standards:
consistently reproduced.
D1129 Terminology Relating to Water
1.3 Many of the turbidity units and instrument designs
D1193 Specification for Reagent Water
covered in this test method are numerically equivalent in
D1889 Test Method for Turbidity of Water (Withdrawn
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calibration when a common calibration standard is applied
2007)
across those designs listed in Table 1. Measurement of a
D2777 Practice for Determination of Precision and Bias of
common calibration standard of a defined value will also
Applicable Test Methods of Committee D19 on Water
produce equivalent results across these technologies.
D4411 Guide for Sampling Fluvial Sediment in Motion
1.3.1 In this test method calibration standards are often
D5847 Practice for Writing Quality Control Specifications
defined in NTU values, but the other assigned turbidity units,
for Standard Test Methods for Water Analysis
such as those in Table 1 are equivalent. For example,a1NTU
D6855 Test Method for Determination of Turbidity Below 5
formazin standard is alsoa1FNU,a1FAU,a1BU,andso
NTU in Static Mode
forth.
E691 Practice for Conducting an Interlaboratory Study to
1.4 This test method does not purport to cover all available Determine the Precision of a Test Method
technologies for high-level turbidity measurement.
2.2 Other Referenced Standards:
1.5 This test method was tested on different natural waters USEPA Method 180.1 Methods for Chemical Analysis of
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Water and Wastes, Turbidity
and wastewater, and with standards that will serve as surro-
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gates to samples. It is the user’s responsibility to ensure the ISO 7027 Water Quality—Determination of Turbidity
validity of this test method for waters of untested matrices. United States Geological Survey (USGS) National Field
1.6 Depending on the constituents within a high-level
sample, the proposed sample preparation and measurement
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methodsmayormaynotbeapplicable.Thosesampleswiththe For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
highestparticledensitiestypicallyprovetobethemostdifficult
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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The last approved version of this historical standard is referenced on
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This test method is under the jurisdiction of ASTM Committee D19 on Water www.astm.org.
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and is the direct responsibility of Subcommittee D19.07 on Sediments, Available from United States Environmental Protection Association (EPA),
Geomorphology, and Open-Channel Flow. Ariel Rios Bldg., 1200 Pennsylvania Ave., NW, Washington, DC 20460, http://
Current edition approved Aug. 1, 2007. Published August 2007. Originally www.epa.gov.
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approved in 2007. Last previous edition approved in 2007 as D7315 – 07. DOI: Available from International Organization for Standardization (ISO), 1 rue de
10.1520/D7315-07A. Varembé, Case postale 56, CH-1211, Geneva 20, Switzerland, http://www.iso.ch.
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D7315 − 07a
TABLE 1 Summary of Known Instrument Designs, Applications, R
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