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The DQM Check for Spike Recovery will qualify results if spike sample recoveries fall outside Quality Control (QC) limits.

 

 

Check

 

Check name is EarthSoft.DQM.SpikeRecovery2 = "Spike Recovery - Multiple Rules".

 

Parameters

 

This check uses the msd_parent_sample_ms, reportable_result, result_type_code, and test_batch_type parameters from Global Parameters.

 

There are eleven other parameters:

•Multiplier – Defaults to 4.

•result_type_code_spike – Defaults to “SC”.

•sample_type_blank_spike – Defaults to “BS,BD”.

•sample_type_matrix_spike – Defaults to “FS,MS,MSD,SD”.

•compare_to_calculated_LCS – Defaults to “N”.

•compare_to_calculated_MS – Defaults to “N”.

•acceptable_variance_LCS – Defaults to 1

•acceptable_variance_MS – Defaults to 1

•calculated_before_reported_LCS – Defaults to “N”.

•calculated_before_reported_MS – Defaults to “N”.

•dilution factor control limit - Control limit for comparison of each result's dilution factor. Results with a dilution factor over the control limit will not be evaluated. Defaults to "5".

 

Additional Notes for Parameters

 

1.If compare_to_calculated = "Y" or calculated_before_reported = "Y" then

 
A Spike Recovery will be calculated for every spike compound using the data populated in the qc_spike_added and qc_spike_measured columns.

 

2.If compare_to_calculated = "Y" then

a.DQM will compare the calculated recovery to the recovery populated in the QC_RECOVERY column.

b.DQM will create an error message in the Errors tab if the difference between the calculated recovery and the reported recovery exceeds the acceptable_variance.

3.If calculated_before_reported = "Y" then

a.DQM will use the calculated value to compare to the Control Limit.

b.If the calculated value is not available, DQM will use the reported recovery value to compare to the Control Limit.

c.If the Control Limit is exceeded, an Exception will be added to the Exceptions table.

 

 

Rules

 

There are twelve rules:

 

 

Additional Notes for the Result Types:

 

Blank Spikes – Review results with:

•DT_SAMPLE.SAMPLE_TYPE_CODE = sample_type_blank_spike, and

•DT_RESULT.RESULT_TYPE_CODE = result_type_code_spike.

Inorganic Spikes – Review results with:

•DT_SAMPLE.SAMPLE_TYPE_CODE = sample_type_matrix_spike,

•DT_RESULT.RESULT_TYPE_CODE = result_type_code_spike, and

•RT_ANALYTE.ORGANIC_YN = 'N'.

Organic Spikes – Review results with:

•DT_SAMPLE.SAMPLE_TYPE_CODE = sample_type_matrix_spike,

•DT_RESULT.RESULT_TYPE_CODE = result_type_code_spike, and

•RT_ANALYTE.ORGANIC_YN = 'Y'.

 

Use of Reason Codes with the rules is discussed here.

 

Calculations (where table is not indicated, it is DT_RESULT_QC)

 

 

RT_DQM_CONTROL_LIMITS is discussed in more detail here.

•If QC_ORIGINAL_CONC > multiplier * QC_SPIKE_ADDED, then skip result.

•If QC_SPIKE_RECOVERY is Numeric,

▪then spikeRecovery = QC_SPIKE_RECOVERY

▪else spikeRecovery for blank spikes = 100 * QC_SPIKE_MEASURED / QC_SPIKE_ADDED and for matrix spikes = 100 * ((QC_SPIKE_MEASURED-QC_ORIGINAL_CONC) / QC_SPIKE_ADDED)

•For Spike Duplicates, if regular columns are NULL, then if QC_DUP_SPIKE_RECOVERY is Numeric,

▪then spikeRecovery = QC_DUP_SPIKE_RECOVERY

▪else spikeRecovery for blank spike duplicate = 100 * QC_DUP_SPIKE_MEASURED / QC_DUP_SPIKE_ADDED and for matrix spike duplicate = ((QC_DUP_SPIKE_MEASURED-QC_ORIGINAL_CONC) / QC_DUP_SPIKE_ADDED)

 

For Blank Spikes:

 

If any of the below values are numeric, the following RT_DQM_CONTROL_LIMIT fields will be used:

•spike_lco = RT_DQM_CONTROL_LIMITS.LCS_REC_LOWER_CUTOFF

•spike_lcl = RT_DQM_CONTROL_LIMITS.LCS_RECOVERY_LCL

•spike_ucl = RT_DQM_CONTROL_LIMITS. LCS_RECOVERY_UCL

•spike_upper_cutoff = RT_DQM_CONTROL_LIMITS. LCS_REC_UPPER_CUTOFF

 

When the value above is not populated:

•spike_lco = 0.0

•spike_lcl = QC_SPIKE_LCL

•spike_ucl = QC_SPIKE_UCL

•spike_upper_cutoff = 999.99

 

For Matrix Spikes (Inorganic and Organic):

 

If any of the below are numeric, the following RT_DQM_CONTROL_LIMIT fields will be used:

•spike_lco = RT_DQM_CONTROL_LIMITS.MS_REC_LOWER_CUTOFF

•spike_lcl = RT_DQM_CONTROL_LIMITS.MS_RECOVERY_LCL

•spike_ucl = RT_DQM_CONTROL_LIMITS.MS_RECOVERY_UCL

•spike_upper_cutoff = RT_DQM_CONTROL_LIMITS.MS_REC_UPPER_CUTOFF

 

When the value above is not populated:

•spike_lco = 0.0

•spike_lcl = QC_SPIKE_LCL

•spike_ucl = QC_SPIKE_UCL

•spike_upper_cutoff = 999.99

 

Associations

 

•For Blank Spikes, associated results are found using TEST_BATCH_ID.

•For Matrix Spike and Matrix Spike Duplicate samples (Inorganic or Organic), associated results are found using the PARENT_SAMPLE_CODEs based on the Global Parameter parameter setting msd_parent_sample_ms.

 

Sample Relationships

 

•When the global parameter msd_parent_sample_ms = “Y”.

oThe PARENT_SAMPLE_CODE for Matrix Spike Duplicate (MSD) sample should match the Matrix Spike (MS) SYS_SAMPLE_CODE.

oThe PARENT_SAMPLE_CODE for the MS sample should match the original sample’s SYS_SAMPLE_CODE.
Although the parent for MSD samples are MS, the result populated in DT_RESUL_QC.QC_DUP_ORIGINAL_CONC should equal the original sample’s result value.

•When the global parameter msd_parent_sample_ms = “N”.

oThe PARENT_SAMPLE_CODE for both the MSD and MS should match the original sample’s SYS_SAMPLE_CODE.

 

Exceptions (see Calculations for definitions):

 

•If spikeRecovery < spike_lco, then qualify spike result and any associated result.

•If spike_lcl > spikeRecovery ≥ spike_lco, then qualify spike result and any associated result.

·If spikeRecovery > spike_ucl, then qualify spike result and any associated result with a detected concentration.

 

An example remark saved to DT_RESULT_DQM_REMARK for an exception is:

 

"Associated Result from : The Blank Spike Recovery is less than the Lower Cutoff."

 

Errors

 
Where table is not indicated, it is DT_RESULT_QC:

•If QC_SPIKE_RECOVERY, QC_SPIKE_ADDED, and QC_SPIKE_MEASURED are all NULL or Not Numeric, then add error and skip result.

•If QC_SPIKE_RECOVERY is NULL or Not Numeric, and either QC_SPIKE_ADDED or QC_SPIKE_MEASURED are also NULL or Not Numeric, then add error and skip result.

•For Spike Duplicates, if regular columns are NULL, apply the same error checking to QC_DUP_SPIKE_RECOVERY, QC_DUP_SPIKE_ADDED, and QC_DUP_SPIKE_MEASURED.

•If the Upper Control Limit is NULL or Not Numeric in both RT_DQM_CONTROL_LIMITS and DT_RESULT_QC, then add error and skip result.

•If the Lower Control Limit is NULL or Not Numeric in both RT_DQM_CONTROL_LIMITS and DT_RESULT_QC, then add error and skip result.

•If compare_to_calculated = Y and the variance between the reported and calculated recoveries exceed the acceptable_variance, then add error and skip result

•If ORIGINAL_CONC exceeds multiplier * QC_SPIKE_ADDED, then add warning and skip result.

•Dilution Factor exceeded the Dilution Factor Control Limit.

 

Example error messages follow.

•"One of the required rules for this check is not present in the RT_DQM_RULE table."
       If you receive this error, the QAPP can be updated following the How to Update Existing QAPPs documentation page.

•“Spike Duplicate Recovery data missing from DT_RESULT_QC for either {QC_SPIKE_RECOVERY} or {QC_SPIKE_ADDED} and {QC_SPIKE_MEASURED}.”  

•“The variance between the reported (90) and the calculated (100) Spike Recovery exceeded the Acceptable Variance (2). at sys_sample_code=BS_1_AQ_UCO_TEST and analytic_method='SW8260' and cas_rn='100-41-4'”

•“Matrix Spike Recovery Check - Skipped Because Original Concentration exceeds Multiplier * Spike Added at sys_sample_code=MSD_2_SOL_UCO_TEST and analytic_method='SW8270' and cas_rn='86-73-7'”

•"Spike Recovery {FIELDNAME} is missing or not numeric;_".

•This check was skipped for TEST_ID = '2622720'  because the Dilution Factor (10) exceeded the Dilution Factor Control Limit (5)