Reagent Shelf Life - Support

Some users of LaMotte test kits are unaware of how to determine the reagent shelf-life, or that length of time when a reagent can, given proper care, produce accurate and reliable results. The incorrect basic guideline used by most seems to be one year from the date of opening. This can lead to both a waste of useful reagents and precious budgeted money. It can also lead to the use of reagents long past their shelf-life because they have only recently been opened.

Sodium Thiosulfate

On the lower, left corner of the label of each LaMotte reagent is a six or seven digit number. This is not a code number, but the lot number of that reagent. A lot number records the date of manufacture and identifies the reagent as part of a specific batch of reagent produced on that date. The first two digits of the lot number identify the week, and the third digit identifies the year of manufacture.

For example using the label above: A reagent with a lot number of 257717 was manufactured the 25th week of the year 2007.

Using the Reagent Shelf-Life Chart (below) and using the information provided within the lot number found on the reagent bottle, the expiration date of the reagent can easily be determined. This date of expiration can then be marked on the label or on a data sheet. This will ensure proper planning for ordering refills.

To determine a reagent's expiration date,

  1. Determine the date of manufacture from the reagent bottle as explained above.
  2. Find the reagent code number on the top left corner of the reagent label.
  3. Look up the code number and see the shelf life which you will add to the manufacture date.
  4. Example: Manufacture date is 25 week of the year 2007. Look up Code 2202 which has a two-year shelf life so the reagent is good until the 25th week of the year 2009.

  5. Exposure to such conditions will compromise the quality and stability of reagents and shorten reagent shelf lives.

 

Reagent Storage Guidelines

Reagents should be stored at 25°C (room temperature) and away from heat, humidity, moisture, direct sunlight and cold conditions. The storage temperature should be kept as constant as possible, without large fluctuations in temperature. Reagents should not be kept refrigerated, unless specified otherwise in the kit instructions or packing literature for the reagents (for example, Coliscan Easygel®). Reagents should not be stored in work vehicles, utility rooms, pool and pump houses or other environments where conditions may be harsh. Exposure to such conditions will compromise the quality and stability of reagents and shorten reagent shelf lives.

 

Reagent Shelf-Life Chart

Reagent Code Description Shelf Life
7026 Phenol Red 3 yr.
7027 PH Indicator 2 yr.
7028 Alk 1 Indicator 18 mo.
7030 Hard 2 18 mo.
7031 CaHard Titrant 3 yr.
7037-G Phenol Red 2 yr.
7038-G Total Alkalinity Indicator 1 yr.
7040-G Calcium Hardness 1 1 yr.
7041-G Calcium Hardness 2 6 mo.
7042 Calcium Hardness 1 Buffer 1 yr.
7102 Nitrite 1 2 yr.
7103 Nitrite 2 18 mo.
7114 Glut. Test Powder 2 yr.
7117 EDTA 3 yr.
7118 Barium Chloride 3 yr.
7119 EDTA 3 yr.
7120 Sulfate Solution 2 yr.
7121 Complex Solution 3 yr.
7122 Buffer 3 yr.
7123 Indicator 3 yr.
7125 Polyquat Titrating 18 mo.
7139 Peroxide Titrant 2 yr.
7140 Acidified Catalyst 2 yr.
7142 Caustic 3 yr.
7166 Alk. Pot. Iodide-Azide 3 yr.
7217 Manganese A 3 yr.
7218 Manganese B 2 yr.
7254 Iodine 1 18 mo.
7255 Iodine 2 2 yr.
7283 Reagent 1 2 yr.
7284 Reagent 2 2 yr.
7285 Reagent 3 3 yr.
7286 Reagent 5 2 yr.
7287 Reagent 4 2 yr.
7288 Reagent 6 3 yr.
7327 Sulfite A 3 yr.
7328 Sulfite B 18 mo.
7329 Sulfite C 2 yr.
7331 Chromate Reagent 2 2 yr.
7332 Chromate Reagent 3 18 mo.
7336 Chloride Reagent 2B 2 yr.
7342 PPK A 2 yr.
7343 PPK B 2 yr.
7344 PPK C 3 yr.
7346 Potassium Bi-Iodate 2 yr.
7361 Zinc Conditioning 2 yr.
7372 Sulfite Reagent #1 3 yr.
7393 Zinc Rgt. 2 yr.
7423 Nitrite Nitrogen A 2 yr.
7424 Nitrite Nitrogen B 3 yr.
7444 Detergent 1 3 yr.
7445 Detergent 3 18 mo.
7456 Peroxide Titrant 2 yr.
7457 Salicylate 2 2 yr.
7458 Salicylate 3 2 yr.
7460 Salinity Indicator A 3 yr.
7461 Salinity Titration B 2 yr.
7520 Standard Turbidity 2 yr.
7607 Amine Indicator 2 yr.
7624 Chloride Reagent 2 2 yr.
7659 Sulfuric Acid 3 yr.
7660 Ferroin Indicator 2 yr.
7661 Ceric Ammon. Nit. 6 mo.
7681 Sulfuric Acid 3 yr.
7682 Potassium Permanganate 18 mo.
7683 Sodium Azide 3 yr.
7688 Nitrogen Dioxide Reagent 18 mo.
7694 Sulfur Dioxide Reagent 2 2 yr.
7695 Sulfur Dioxide Reagent 3 2 yr.
7727 Sulfide reagent 2 2 yr.
7727 Sulfide Reagent 2 2 yr.
7729 Sulfide Reagent 4 2 yr.
7730 Sulfide Reagent 5 3 yr.
7730 Sulfide Reagent 5 3 yr.
7745 Sodium Hydroxide 3 yr.
7748 Sulfuric Acid 3 yr.
7756 Silver 1 3 yr.
7757 Silver 2 2 yr.
7758 Silver 3 2 yr.
7797 Nitrite-Nitrogen CR 18 mo.
7825 Aminoantipyrine 2 yr.
7826 Ammonium Hydroxide 3 yr.
7827 Pot. Ferricyanide 2 yr.
7833 Tannin 1 3 yr.
7834 Tannin 2 3 yr.
7837 SDMBT 1 2 yr.
7838 SDMBT Reagent 2 2 yr.
7838 SDMBT Reagent 2 2 yr.
7841 Potassium Sodium 3 yr.
7865 Aluminum Inhibitor 2 yr.
7866 Aluminum Buffer 2 yr.
7867 Aluminum Indicator 18 mo.
7868 Aluminum Complex. 3 yr.
7885 Sulfuric Acid 3 yr.
7886 Sodium Hydroxide 3 yr.
7886 Sodium Hydroxide 3 yr.
7888 Boiling Stones n/a
7927 Sodium Thiosulfate 0.141N 18 mo.
7939 Hypochlorite A 3 yr.
7940 Hypochlorite B 2 yr.
7941 Hypochlorite C 1 yr.

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