OC Laboratory

Laboratory Event      

Event Coordinator - 

Kim Furry

Event Info Bench Sheet and Calcs Mass Balance TablesMulti Lab
2021 Event Description 
updated 2/17/21
TDS_Bench_Sheet.xls Mass_Balance_Test_Metric.docx Table LayoutW-142 MultiLab Ordering Form Guide
Judges Sheets
updated 2/17/21
TSS_Calculation_Sheet.xls Mass_Balance_Test.pdf**Scale Table: 
MultiLab 4010-2W Conductivity Temp jpg
 TSS_Preparation_Sheet.xls **MultiLab Meter Table:  https://youtu.be/gABYa1o3M08  W-142 MultiLab Ordering Form Guide
 Solids Loading Calculation Sheet and Plant Diagram.pdf 2/25/19  YSI Meter and Probe Ordering Details
 Solids Loading Calculation Sheet and Plant Diagram - METRIC 2/25/19  Example Invoice for YSI
**This video is for informational purposes only and may not necessarily be a clean run.  Please refer to the Team Resource Site for the newest version of the rules/tasks/guidelines.

Ask A Question

 Question Answer Date
Not a question...Just FYI the part number for the Carboy in the event description is wrong... the number given is for a carboy WITHOUT the spigot...this should probably be changed.The equipment list has been updated with the correct product number.1/13/20
Can the person on the Mass Balance complete both forms for TSS? Or does the person doing the filtering have to complete one?The same person may complete both TSS bench sheets.
Under procedures for Preparation and Analysis of Total Suspended Solids Samples Item #8
In bold print and starting in all caps--8. NOTE: DO NOT OVERFILL the filter flask.
In looking at the judges sheets, I can't seem to find it listed as a violation. Will overfilling the primary filter flask result in a penalty? If water is allowed into the vacuum pump from the secondary filter flask is that an additional and/or greater penalty?
This is penalty #43 on the Judge 3 sheet.  Technically based on volume, the team should be able to filter all of the samples and not have to empty the primary flask.  If it does carry over to the secondary flask, this will result in the penalty #43.  It should never carry over from the secondary flask to the vacuum pump based on the volumes being used.  This is why the secondary flask was put into place.
Are new mass balance calculation sheets (math portion) going to be distributed in the upcoming month, or couple of months?No, new mass balance calculation sheets will not be distributed.  As of this time, the questions will remain the same this year; however, the plant data at the top will change.  As such, teams should be practicing the calculations utilizing various plant data sets.2/11/20
When seasoning the graduated cylinders on the TDS, can you also use that sample from the cylinders to season the corresponding beakers?
Teams may not rinse the graduated cylinder into the beaker and then discard the solution.  You must rinse the graduated cylinders separately from the beakers.
Do TDS pipettes and beakers have to be rinsed with DI water or can you use samples?
The beakers and graduated cylinders being utilized for the TDS analysis should be rinsed with sample prior to pouring for analysis.  There are no pipettes used in the TDS preparation or analysis.2/18/20
Under Equipment, there are 4-100 ml graduated cylinders listed for use in the event. The procedure states:
3. Label three (3) 100 ml graduated cylinders for the TDS test as follows:
1. BLK (Blank)
2. SEC (Secondary Effluent)
3. EFF (Final Effluent)
NOTE: EFF cylinder can be utilized to measure Effluent Duplicate sample.

Question: Can the 4 fourth unused graduated cylinder be used to measure one of the samples also, if it is properly labeled and rinsed per sampling procedure?

Yes, the fourth unused graduated cylinder may be used to measure sample as long as it is clearing and appropriately labeled and used to measure the TDS sample.3/2/20
Do we need to rinse the beaker and graduated cylinders for the blanks with DI water before filling of the cylinders and beaker with DI water for the blanks?Yes, the beakers and graduated cylinders associated with the blanks should be rinsed with DI water prior to filling them for analysis.
In regards to previous question about overfilling the primary filter flask. I'm still confused as to if the overflowing of filter water into the secondary flask as a penalty? It is stated that it will be a penalty and that emptying the primary will not be necessary with the volume of samples used.

But given the flowing volumes from the procedure:

Blank - 400, Eff - 250, Sec - 250, Pri Eff - 50, Inf - 15, Inf Dup - 15, Aer 1 - 10, Aer 2 - 10 the total volume would be exactly 1000 mls.
Given the procedure asks for 3 -10 ml rinses on the funnel for each sample and 2 rinses of unspecified volumes of each of the graduated cylinders and pipettes, how can technically the procedure be completed without overflow into the secondary flask, if each flask is 1000 mls?

Overfilling the primary flask into the secondary flask will result in a penalty.  If a team uses too much sample or duplicates a sample etc. there is the possibility to go over the volume the flask can hold.  The flask holds more than 1000 mL.  There is headspace between the 1000 mL mark and the opening to the vacuum tubing.  Teams routinely properly perform the steps including rinsing without exceeding the total volume of the primary flask.