Question/Answer

how do i obtain the C.O.A. and S.D.S. for this product?

Those documents can be found at http://www.envexp.com/coa and http://www.envexp.com/sds.

What is the CBOD values for gga?

Standard Methods requires that the same acceptance range for GGA results,198±30.5, be applied to all BOD/CBOD analyses. The method advises adjusting the amount of seed used to bring results in that range.

Can I look up the expiration date of a specific lot?

We do not have a searchable database where you can search by expiration dates for products. The expiration date is listed on the Certificate of Analysis (COA) for the specific lot number. You can find the COAs on our website under BOD standard.\r\n\r\n \r\n

What is the concentration of cBOD?

The cBOD value is the same as the BOD value for GGA. It should be in the range specified by the method, 198 ± 30.5 mg/L.

I just purchased GGA solution 24X6 mL lot #F029-02. What is the concentraction? 198?

Each vial contains 6mL of the APHA specified concentration of Glucose/Glutamic Acid (150mg/L of Glucose, 150mg/L of Glutamic Acid). When used properly, the standard should give you a result of 198 ± 30.5 mg/L BOD.

What is the shelf life of catalog: LC148451 (GGA 500ml)

The shelf life of unopened product is 2 years. It is good for 30 days once it is opened.

What is the expiration date on the LC148451 glucose glutamic acid. Thanks,

The shelf life of an unopened vial is 2 Years. The shelf life of an opened vial is 30 days.

What is the pH of the GGA solution?

Standard Methods does not have a pH requirement for the GGA standard. Therefore, we do not specifiy it on our CofA. You would have to test for the pH of the solution. We offer pH meters and testing strips at Environmental Express.

is the desired answer for the glucose glutamic acid cbod5 standard 198+-30mgl

The desired BOD value for the GGA standard is 198 ± 30.5 mg/L BOD.

what is the concentration in PPM of BOD Standard? Is it 300 ppm?

The BOD standard is a mix of two different components, glucose and glutamic acid. The concentration of each of those in the standard is 150 mg/L. However, the concentration of the components is not the same as the BOD value of the standard. When used properly, the standard will give you a result of 198 ± 30.5 mg/L BOD.

The box states \"Refrigerate after opening.\" Does that mean after opening the box of sealed vials or after opening a sealed vial? In other words, do the sealed vials need to be refrigerated?

Those instructions refer only to the individual vial. The sealed vials can be stored on the bench top at ambient conditions.

What is the concentration of the GGA, how much is it, who is the mfg\'r?

The true value for the GGA standard is 198 mg/L (+/- 30.5 mg/L) BOD and is manufactured by LabChem. Part # D1243 is an equivalent EE product that are individual vials and do not need to be pipetted out of the larger bottle. Please contact sales@envexp.com for current pricing.

We have been using QCI-084 for quite a while. Our CBOD results tend to run on the high side, sometimes out. Any thoughts? Lot#121013 and 021214 are the latest used. Thanks.

Per Standard Methods the BOD and CBOD results for your GGA standard should be the same and actually have the same acceptance limits. It has always been my experience that the nitrification inhibitor does have an affect on final CBOD values despite this though those values for the GGA have always been typically lower than BOD values. I would run the GGA standard as a BOD along side your CBOD samples to determine if there is a significant difference in adding the inhibitor or not.

certificate of analysis

Please see http://www.envexp.com/coa and select the link for your product. We try to keep this up to date but occasionally miss one. If you do not see the COA for your lot please email info@envexp.com with details or call our technical support line at 800-745-8218.

Do you have a certification document for the BOD standard? If so, where can I get a copy?

Please visit http://www.envexp.com/coa for a list of COA\'s for this, and many other, products. If you do not see the lot number that corresponds to your product please contact us directly and we will send you a copy.

Where are your MSDSs located for products?

Our MSDS files are located here - http://www.envexp.com/msds.

How do I get a copy of the certifcate of analysis for a GGA lot?

Most of our certificates of analysis are found at the following link - http://www.envexp.com/coa. If you do not find the lot number listed under the appropriate section please email info@envexp.com with the lot number and catalog number that you need and we will be happy to provide the information you need.

What is the acceptance range for the reference product GGA D1243 for cBOD?

Standard Methods 5210B (2001) section 5. e. deals with the nitrification inhibitor. It instructs that the amount of seed used should be sufficient to achieve GGA results in the range of 198 ± 30.5 mg/L. For that reason we do not list different true values and acceptance ranges for BOD vs. cBOD.

How much volume should be added in 300ml BOD bottle if GGA solution prepared as per APHA standard?

When using the GGA solution that has been prepared according the method, you should have 6 mL of this standard added into a 300 mL BOD bottle. You will add whatever volume of seed is needed from your seed source to achieve the proper oxygen depletion and the remainder of the volume will be done with dilution water.

WHY IN SIME CASES BOD VALUE IS GREATER THAN COD?

The BOD value of any substance should never be greater than the COD value within the margin of error for each test. If you have results that seem to indicate otherwise you are probably experiencing some sort of negative interference with the COD analysis or a positive contaminant with the BOD analysis.

Is certificate of analysis availble for this product

Yes, a certificate of analysis is available. If one did not come with your product please contact info@envexp.com with the your lot number and a COA will be provided to you.

Do D1243-BOD: Glucose-Glutamic Acid, 24x6mL vials contain any preservatives? We are having periodic low GGAs.

This solution is made exactly as specified in Standard Methods. There is no preservative available for the GGA standard. The vials are sterilized via autoclave after being filled so that no bacterial activity will degrade the components in the vials.

Can we use these standard for calibration of analytical equipment and analysis of waste water,sewage water and effluent water application? If possible how?

This standard can be used to check the calibration of your analytical procedures and equipment. It comes with a certified value and acceptance range for each of the parameters listed. Simply measure out the amount of standard as required by the test method and analyze it exactly as you would a sample.

Is refrigeration required for item # D1243S

The G:Ga standards do not require refrigeration of any kind. The MSDS requires storage capped at room temperature.

Besides seed volume variation, what would cause out of range recoveries for GGA?

There are any number of things that could cause out of range G:GA values. Dilution water quality, strength of seed, incubation temperature and probe calibration are some of the more likely causes. I would be glad to discuss some scenarios and trouble shooting with you. Email me at DavidS@envexp.com or call 1-843-576-1133 and we can go over the process.

Can you send me a sample?

This product is not available to sample.

what is the shelf life of your Universal Wastewater Standard

This product has an expiration date of 1-year from date of manufacture.

Does the pH of the check standard solution need adjusted or just set as is? The analysts have been pH adjusting the GGA they make in house; however, I do not recall doing that in my previous position

The pH of all samples for the BOD test should fall within a value of 6.5 - 7.5. Your blanks, GGA, and seed should be analyzed as-is as the method does not call for any pH adjustment of these solutions.

Is there a range for BOD or just 198mg/L ?

Standard Methods 5210 states that the true value of the GGA standard to be 198 mg/L with an acceptance range of +/- 30.5 mg/L. To comply with the method you should always use this range. This standard as well as the other GGA standards we offer meet the Standard Methods requirements.

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