1 / 6

Ashing Procedure

Pre-weighed crucible. Sample. Sample. +. +. Record weight of digested and dried filter bag with sample enclosed. Ashing Procedure. Record weight of a clean crucible or other suitable vessel for ashing process. (. ). +. Insert filter bag/sample into crucible and ash.

camilla-todd
Télécharger la présentation

Ashing Procedure

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pre-weighed crucible Sample Sample + + Record weight of digested and dried filter bag with sample enclosed Ashing Procedure Record weight of a clean crucible or other suitable vessel for ashing process ( ) + Insert filter bag/sample into crucible and ash

  2. Ashing Procedure - Sample Crucible weight = 25.5138 grams Sample + Digested Filter bag/sample weight = ..5193 ( ) Sample + + Combined weight = 26.0331 grams Pre-weighed crucible

  3. Pre-weighed crucible Ashing Procedure - Sample After Ashing (550°- 600°C) Re-weigh crucible and contents and record weight ( ) + Combined weight after ashing = 25.5161 grams Remaining ash (inorganic matter)

  4. Pre-ignition Combined weight of crucible and filter bag/sample = 26.0331 grams Minus Combined weight after ashing = 25.5161grams Loss of weight after ignition = 0.5170 grams (organic matter) Ashing Procedure - Sample Determining loss in weight after ignition (Ashing)

  5. (0.5170 - (.4889 x 0.9992)) x 100 1.0019 CF = 2.844595 Ashing Procedure - Sample Using the ashing results in a formula Example given - CF (W4-(W1 x C2)) x 100 W2 x DM W1 = Original bag weight W2 = Sample Weight W3 = Weight after extraction W4 = Weight of Organic Matter (Loss of weight on ignition of bag & fiber residue) C1 = Blank Bag Correction (final oven-dried weight/original bag weight) C2 = Ash corrected blank bag (Loss of weight on ignition of bag/original blank bag) SEEEXAMPLE NEXT PAGE DM = Dry Matter value as decimal

  6. Ashing Procedure - SampleDetermining C2 Value • Weight of ashing vessel + weight of blank bag AFTER extraction • Subtract weight of ashing vessel AFTER ashing • Divide result by original weight of bag after extraction • E.g. (Crucible) 26.0192 +.5021 = 26.5213 After Ash weight - 26.0196 0.5017/0.5021 = 0.9992

More Related