ASTM E2043-99

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Designation: E 2043 – 99
Standard Test Method for
Nonvolatile Matter of Agricultural Adjuvant Solutions by
Thermogravimetry
This standard is issued under the fixed designation E 2043; 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 nonvolatile content is desired or a comparison can be made
with a known material of the same type.
1.1 This test method covers the determination of the non-
5.2 The parameters described may be altered to suit a
volatile matter of agricultural tank mix adjuvant solutions by
particular analysis, provided the changes are noted in the
thermogravimetry.
report.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Apparatus
responsibility of the user of this standard to establish appro-
6.1 Aluminum Weighing Dishes, flat bottom, 70 mL capac-
priate safety and health practices and determine the applica-
ity.
bility of regulatory limitations prior to use.
6.2 Analytical Balance, with a sensitivity of 0.01 g.
2. Referenced Documents 6.3 Desiccator.
6.4 Drying Oven, gravity convection-type, capable of main-
2.1 ASTM Standards:
tainingatemperatureof50 62.5°C.Ifmanydeterminationsof
E 473 Terminology Relating to Thermal Analysis
solvent-based adjuvants are being made at the same time, an
E 1131 Test Method for Compositional Analysis by Ther-
explosion-proof oven should be used.
mogravimetry
E 1519 Terminology Relating to Agricultural Tank Mix
7. Procedure
Adjuvants
7.1 Bring the material to be tested to equilibrium tempera-
3. Terminology ture at 25 6 5°C.
7.2 Dry two flat-bottomed aluminum weighing dishes in an
3.1 Definitions:
oven at 50 6 2.5°C for 1 h. Allow the dishes to return to
3.1.1 nonvolatile matter, n—the matter remaining after
ambient temperature in a desiccator.
heating an agricultural adjuvant solution at 50 6 2.5°C for 16
7.3 Weigh each dish, making the determination in duplicate.
h.
Record the weight of the weighing dish to the nearest 0.01 g.
4. Summary of Test Method
7.4 Add approximately 2.0 6 0.1 g of agricultural adjuvant
solution to the aluminum weighing dish. Record the total
4.1 This test method is an empirical technique using ther-
weight of the sample and dish to the nearest 0.01 g.
mogravimetry in which the mass of an agricultural adjuvant,
7.5 Place the dish in an oven at 50 6 2.5°C. Maintain this
heated at a controlled rate in an appropriate environment, is
temperature for 16 h 6 5 min. Begin timing when the oven has
recorded as a function of time a
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