Laboratory Performance for Calendar Years 2017 ... - USGS

12:06 Tuesday, October 3, 2023 1

Z-Value

Laboratory Performance for Calendar Years 2019 through 2023 (5 years) Lab: 142

SRS Major Sample: Alkalinity as CaCO3 USGS Quality Systems Branch (QSB) Standard Reference Sample (SRS) Project Results

3.0

3.0

2.5

2.5

2.0

2.0

1.5

1.5

1.0

1.0

0.5

0.5

0.0

0.0

-0.5

-0.5

-1.0

-1.0

-1.5

-1.5

-2.0

-2.0

-2.5

-2.5

-3.0

-3.0

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

2019

2020

2021

2022

2023

2024

End Date of SRS Round

Reference Material (MPV in milligrams per liter)

M-230 (51)

M-232 (14)

M-234 (35.4)

M-236 (18.6)

M-238 (60)

M-240 (27.2)

M-242 (40.5)

M-244 (59.4)

M-246 (37)

M-248 (74.6)

Updated: 10/03/2023

12:06 Tuesday, October 3, 2023 2

Laboratory Performance for Calendar Years 2019 through 2023 (5 years) Lab: 142

SRS Major Sample: Alkalinity as CaCO3 USGS Quality Systems Branch (QSB) Standard Reference Sample (SRS) Project Results

80

60

milligrams per liter

40

20

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

2019

2020

2021

2022

2023

2024

End Date of SRS Round

Reference Material (MPV in milligrams per liter)

Most Probable Value +/- 2 FPS

Laboratory Value Updated: 10/03/2023

12:06 Tuesday, October 3, 2023 3

Z-Value

Laboratory Performance for Calendar Years 2019 through 2023 (5 years) Lab: 142

SRS Major Sample: Boron USGS Quality Systems Branch (QSB) Standard Reference Sample (SRS) Project Results

3.0

8.62

3.0

2.5

2.5

2.0

2.0

1.5

1.5

1.0

1.0

0.5

0.5

0.0

0.0

-0.5

-0.5

-1.0

-1.0

-1.5

-1.5

-2.0

-2.0

-2.5

-2.5

-3.0

-6.38

-3.0

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

2019

2020

2021

2022

2023

2024

End Date of SRS Round

Reference Material (MPV in micrograms per liter)

Off-scale (actual value)

M-230 (26)

M-238 (150)

M-240 (98.8)

M-242 (68.4)

M-244 (105)

M-246 (30)

M-248 (130)

Updated: 10/03/2023

12:06 Tuesday, October 3, 2023 4

Laboratory Performance for Calendar Years 2019 through 2023 (5 years) Lab: 142

SRS Major Sample: Boron USGS Quality Systems Branch (QSB) Standard Reference Sample (SRS) Project Results

150

micrograms per liter

100

50

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

2019

2020

2021

2022

2023

2024

End Date of SRS Round

Reference Material (MPV in micrograms per liter)

Most Probable Value +/- 2 FPS

Laboratory Value

Updated: 10/03/2023

12:06 Tuesday, October 3, 2023 5

Z-Value

Laboratory Performance for Calendar Years 2019 through 2023 (5 years) Lab: 142

SRS Major Sample: Bromide USGS Quality Systems Branch (QSB) Standard Reference Sample (SRS) Project Results

3.0

3.0

2.5

2.5

2.0

2.0

1.5

1.5

1.0

1.0

0.5

0.5

0.0

0.0

-0.5

-0.5

-1.0

-1.0

-1.5

-1.5

-2.0

-2.0

-2.5

-2.5

-3.0

-3.0

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

Jul

Jan

2019

2020

2021

2022

2023

2024

End Date of SRS Round

Reference Material (MPV in milligrams per liter)

M-232 (0.44)

M-234 (0.126)

M-236 (0.177)

M-238 (0.614)

M-240 (0.288)

M-242 (0.511)

M-244 (0.1)

M-246 (0.534)

M-248 (0.406)

Updated: 10/03/2023

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