ASTM D7315-07
(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 4.)
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 Table 1. 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 Table 1 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.
1.7 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: D 7315 – 07
Standard Test Method for
Determination of Turbidity Above 1 Turbidity Unit (TU) in
1
Static Mode
This standard is issued under the fixed designation D 7315; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers the static determination of
responsibility of the user of this standard to establish appro-
turbidity in water. Static refers to a sample that is removed
priate safety and health practices and determine the applica-
from its source and tested in an isolated instrument. (See
bility of regulatory limitations prior to use. Refer to the MSDSs
Section 4.)
for all chemicals used in this procedure.
1.2 This test method is applicable to the measurement of
turbidities greater than 1.0 turbidity unit (TU). The upper end
2. Referenced Documents
of the measurement range was left undefined because different
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2.1 ASTM Standards:
technologies described in this test method can cover very
D 1129 Terminology Relating to Water
different ranges. The round robin study covered the range of
D 1193 Specification for Reagent Water
0–4000 turbidity units because instrument verification in this
D 1889 Test Method for Turbidity of Water
range can typically be covered by standards that can be
D 2777 Practice for Determination of Precision and Bias of
consistently reproduced.
Applicable Test Methods of Committee D19 on Water
1.3 Many of the turbidity units and instrument designs
D 4411 Guide for Sampling Fluvial Sediment in Motion
covered in this test method are numerically equivalent in
D 5847 Practice for Writing Quality Control Specifications
calibration when a common calibration standard is applied
for Standard Test Methods for Water Analysis
across those designs listed in Table 1. Measurement of a
D 6855 Test Method for Determination of Turbidity Below
common calibration standard of a defined value will also
5 NTU in Static Mode
produce equivalent results across these technologies.
E 691 Practice for Conducting an Interlaboratory Study to
1.3.1 In this test method calibration standards are often
Determine the Precision of a Test Method
defined in NTU values, but the other assigned turbidity units,
2.2 Other Referenced Standards:
such as those in Table 1 are equivalent. For example,a1NTU
USEPA Method 180.1 Methods for Chemical Analysis of
formazin standard is alsoa1FNU,a1FAU,a1BU,andso
3
Water and Wastes, Turbidity
forth.
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ISO 7027 Water Quality—Determination of Turbidity
1.4 This test method does not purport to cover all available
United States Geological Survey (USGS) National Field
technologies for high-level turbidity measurement.
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Manual for the Collection of Water Quality Data
1.5 This test method was tested on different natural waters
and wastewater, and with standards that will serve as surro-
3. Terminology
gates to samples. It is the user’s responsibility to ensure the
3.1 Definitions—For definitions of terms used in this test
validity of this test method for waters of untested matrices.
method refer to Terminology D 1129.
1.6 Depending on the constituents within a high-level
sample, the proposed sample preparation and measurement
methodsmayormaynotbeapplicable.Thosesampleswiththe
2
highestparticledensitiestypicallyprovetobethemostdifficult
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to measure. In these cases, and alternative measurement contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
method such as the process monitoring method can be consid-
the ASTM website.
ered.
3
Available from United States Environmental Protection Association (EPA),
Ariel Rios Bldg., 1200 Pennsylvania Ave., NW, Washington, DC 20460, http://
www.epa.gov.
1 4
This test method is under the jurisdiction of ASTM Committee D19 on Water Available from International Organization for Standardization (ISO), 1 rue de
and is the direct responsibility of Subcommittee D19.07 on Sediments, Geomor- Varembé, Case postale 56, CH-1211, Geneva 20, Switzerland, http://www.iso.ch.
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phology, and Open-Channel Flow. AvailablefromUnitedStatedGeologicalSurvey(USGS),12201SunriseValley
Current edition approved April 15, 2007. Published May 2007. Drive, Reston, VA 20192, http://www.usgs.gov.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States.
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