Total Dissolved Solids:
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1 Total Dissolved Solids: Going From Tedious to TDS Michael Bechtold, Technical Specialist
2 Total Dissolved Solids (TDS) What is it and why does it matter? How is it currently being tested? Why is TDS so tedious? New products that alleviate these frustrations.
3 What is it and why does it matter? TDS, or Total Dissolved Solids, refers to the amount of organic and inorganic dissolved substances that may be found in your water. Minerals Metals Salts Pesticides
4 What is it and why does it matter? Principal application of TDS is in the study of water quality for streams, rivers, and lakes. Not generally considered a primary pollutant. Used as an indication of aesthetic characteristic of drinking water. Aggregate indicator of the presence of a broad array of chemical contaminants.
5 What is it and why does it matter? Practical implications of TDS: Hard water Magnesium, calcium, and variety of other metals Scale buildup in pipes, valves, and filters Reduces effectiveness of soap Dry, itchy skin Soap scum
6 What is it and why does it matter?
7 What is it and why does it matter?
8 What is it and why does it matter?
9 What is it and why does it matter?
10 What is it and why does it matter?
11 What is it and why does it matter?
12 What is it and why does it matter? Practical implications of TDS: Water aesthetics Odor Taste Color Turbidity
13 What is it and why does it matter?
14 What is it and why does it matter?
15 What is it and why does it matter?
16 What is it and why does it matter? Practical implications of TDS: Life Aquatic and terrestrial organisms
17 How is it currently being tested? Three approved methods: SM2540C 1997 ASTM D USGS I TDS range of various water sources. Ocean water 30,000-40,000 mg/l TDS Fresh Water mg/l TDS Drinking Water <300 mg/l TDS Laboratory grade water <10 mg/l TDS
18 How is it currently being tested? TDS meter Digital or analog meters that measure the electrical conductivity or water. Estimate what the true TDS levels might be. Use conversion factors to account for different quantities of dissolved substances.
19 How is it currently being tested? Sample is filtered through a 1.5mm, washed and dried, glass fiber filter. Filtrate transferred into an evaporating dish. Liquid evaporated to dryness. Dish and residue heated to 180 C for one hour. Dish and residue cooled to room temperature and weighed on balance. Repeat cycle of 180 C heating, cooling, and weighing until two consecutive ± g results.
20 Why is TDS so tedious? Weight comparison sample vs. apparatus Method approved sample yield mg. Currently approved TDS apparatuses set forth in SM 2540B. 2a ) Porcelain most common, least expensive 2) Platinum lightest but most expensive 3) High-silica glass Porcelain weighs 80 grams on average 400x 32,000x difference between sample
21 Why is TDS so tedious? Weight comparison sample vs. apparatus 400x
22 Why is TDS so tedious? Weight comparison sample vs. apparatus 32,000x
23 Why is TDS so tedious? Weight comparison weight stability vs. apparatus Porcelain is a porous material and gains weight ± g relative to 80 g porcelain crucible 160,000X difference
24 Why is TDS so tedious? Weight comparison weight stability vs. apparatus 160,000x
25 Why is TDS so tedious? Time to cool crucible to room temperature Takes about 1 hr. to cool to balance temperature The best way to achieve consistent results is to allow the same cooling/desiccating time each time the sample is weighed
26 Why is TDS so tedious? Washing and preparing crucibles for use heat clean dish to 180 ± 2 C for 1 h in an oven. Store in desiccator until needed. Weigh immediately before use.
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29 StableWeigh TDS Vessels Made from a patented proprietary material that is functional up to 200 C Preconditioned and preweighed. Holds about 300 ml of sample
30 StableWeigh TDS Vessels
31 StableWeigh TDS Vessels
32 StableWeigh TDS Vessels
33 StableWeigh TDS Vessels
34 StableWeigh TDS Vessels
35 StableWeigh TDS Vessels Vessels weigh around 3.8 grams About 20x less than a crucible Weight stable to ± g Less reweighing Cools to balance temperature in 15 minutes. Ready to use out of box Disposable
36 StableWeigh TDS Vessels 5 mg 10 mg 50 mg 100 mg 200 mg Lot Printed Weight First Weight 1st - Printed Wght. Diff (in mg) % Recovery Second Weight 2nd - Printed Wght. Diff (in mg) % Recovery 2nd - 1st Weight (g) Wght. Diff (in mg) E E
37 what about method compliance?
38 StableWeigh TDS Vessels Update to SM 2540B: 2a.4 Other material shown to be resistant to the sample matrix and weight stable at the required evaporation and drying temperatures.* Aluminum is not appropriate for this purpose. *Environmental Express StableWeigh or other products giving demonstrably equivalent results to the proscribed crucibles.
39 StableWeigh TDS Vessels ASTM D :
40 Launching April 15 th!
41 Thank you for your time!
42 Questions???
Total Dissolved Solids: Environmental Express StableWeigh Analytical Testing Vessels. Dr. Edward F. Askew June 15, 2016
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