Polymer total dissolved solids vessel

a total dissolved solids and polymer technology, applied in the thin field of thin, can solve the problems of affecting the consumption, use, and consumption of water, and many of the available water supplies to be exceeded, so as to improve the conformance of the test, reduce the risk of cross contamination due to improper washing, and accurate low-weight testing

US20150268146A1Inactive Publication Date: 2015-09-24ENVIRONMENTAL EXPRESS INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2015-09-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

A thin film vessel useable in gravimetric methods for measuring the total dissolved solids or total solids in a liquid sample, or the moisture content of a solid sample. The vessel includes a main body formed of a thin walled polymeric material having a melting temperature greater than 180° C. The main body comprises an open top edge and a sealed bottom edge which define an inner cavity configured to hold a volume of liquid, and indicia applied to a portion of the main body, wherein the indicia include a tare weight of the vessel.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Technical Field of the Invention

[0002] This invention pertains generally to a polymeric vessel or bag useable for testing of total dissolved solids and total solids in a sample. More specifically, the invention pertains to a thin film vessel or bag formed of a polymeric material with a melt temperature greater than 180° C. which may be used in gravimetric methods for measuring the total dissolved solids and total solids in a liquid sample, or the percent moisture of a solid sample.

[0003] 2. Description of the Related Art

[0004] The term “total dissolved solids” refers generally to any inorganic materials (minerals, salts, metals, cations, and / or anions) and / or organic materials that are dissolved in a water sample. The term “total suspended solids” refers generally to the small solid particles that remain in suspension in a water sample and which may be collected on a filter having a pore size of two micrometers. Together, the suspended solids and dis...

Examples

examples

[0048]Vessels formed according to embodiments of the presently disclosed invention were used for TDS testing according the protocols described in ASTM D5907 or Standard Methods 2540 B, C, or D as listed in the Code of Federal Regulations (40 CFR 136.3) or USGS I-1750-85. These protocols are periodically updated with changes to the methods and / or protocol numbers. Thus, while specific protocol numbers and method details have been listed herein, the vessels and methods of the presently disclosed invention may find utility in methods beyond those listed. For example, the vessels may be used in methods which require heating temperatures greater than 180° C., such as greater than 200° C., or even greater than 225° C. Furthermore, typical volumes contained within the vessel are listed herein as less than 500 mL, preferably less than 150 mL. Changes in standard methods may require that greater or lesser volumes of sample are tested. As such, the vessels of the presently disclosed invention...

example a

[0056]Both nylon and PET materials were used to form a thin film vessel according to the configuration shown in FIG. 3. A specific weight of KO was dissolved in water and placed in each of the testing vessels (column labeled “Total Dissolved Solids Standard Weight (mg)”). The liquid was evaporated and the weight of the vessel was recorded after two preconditioning steps. The results from this TDS Standard testing are listed in Table 1. Both PET and Nylon vessels showed excellent recoveries. In addition, a low weight trial of 5 mg (trial #5) was performed and showed similar recovery percentages.

TABLE 1Total Dissolved Solids standard testing recoveriesusing thin wall polymeric vesselsInitialVesselTotal DissolvedTotal DissolvedTrialVesselWeightSolids StandardSolids Recovered%No.Material(grams)Weight (mg)Weight (mg)Recovery1PET0.53724167167.1100.06%2Nylon0.6867160.4160.399.94%3Nylon0.46314148149.26100.85%4Nylon4.54338142.2141.4399.46%5Nylon2.28035.045.1101.19%

example b

[0057]Nylon vessels having a tare weight of less than 1 gram were tested for a range of standard weight recoveries which include standard weight samples comprising low (less than 100 mg), medium (between 100 mg and 150 mg), and high (greater than 150 mg) solids content. A control (blank) was included for several of the testing series, wherein the blank comprised water only. A standard test was considered successful (passed) if the final weight was within 10% (100%±10%), while a control (blank) test was considered successful if the final weight was within ±0.01 grams of the tare weight.

[0058]Results from TDS testing Test using low weight samples of 10 mg are shown in Table 2, and low weight samples of about 25 mg are shown in Tables 3 and 4. Additional testing was performed by a testing laboratory according to the same protocol using nylon vessels as described herein. Results from high weight trials (200 mg) are shown in Tables 5 and 6, results from medium weight trials (100 mg) are ...