Lachat run LTER Lysimeters 04/03/2023.

Prepared standards.

Prepared fresh Phosphate Buffer (1L) 28 gms Sodium Hydroxide pellets 50 gms sodium phosphate dibasic heptahydrate dilute to 1 L with nanopure.

Prepared EDTA Reagent (1L) 66 gms ethylenediamine tetraacetic acid disodium salt dihydrate (EDTA) Approximately 7.0 gms sodium hydroxide pellets ph to 7.03 with NaOH pellets then dilute to volume with nanopure.

Acid washed dishes.

Acid washed dishes and reagent containers from Channel 1.

Lachat run LTER Lysimeters 03/21/23

Prepared Standards

Prepared Color Reagent (2 L) 200 ml phosphoric acid 80 gm sulfanilamide, 2.0 gm N-1-naphthylethylenediamine dihydrochloride, Dilute to 2L with Nanopure H2O.

Acid washed dishes and Channel 2 Lachat reagent containers.

Lachat run LTER T4 soil 07/17/2023

Acid washed dishes. Lachat run LTER T3 soil 07/17/2023.

Replaced reagent tubing on Lachat.

Lachat run 9-25 and 9-28 2023 T0 post shelter REX (Grant).

Lachat run of dilutions from 8/28 and 8/30 2023 T0 Post drought REX (Grant).

Prepared standards, Lachat run 8/28 and 8/30 2023 T0 Post drought REX (Grant)

Prepared standards, reconditioned cadmium column, Acid washed dishes.

Prepared Ammonium Chloride Reagent (4L): 320 gms Ammonium Chloride 4.0 gms EDTA pH to 8.45 with NaOH, store

Prepared fresh Phosphate Buffer (1L) 28 gms Sodium Hydroxide pellets 50 gms sodium phosphate dibasic heptahydrate dilute to 1 L with nanopure.

Prepared EDTA Reagent (1L) 66 gms ethylenediamine tetraacetic acid disodium salt dihydrate (EDTA) Approximately 7.0 gms sodium hydroxide pellets ph to 7.03 with NaOH pellets then dilute to volume with nanopure.

Replaced Cadmium Column, acid washed dishes.

Lachat run 8-14-2023 and 8-16-2023 T0 Peak drought REX soil (Grant).

Prepared Color Reagent (2 L) 200 ml phosphoric acid 80 gm sulfanilamide, 2.0 gm N-1-naphthylethylenediamine dihydrochloride, Dilute to 2L with Nanopure H2O.

Lachat run 6-21-2023 and 6-23-2023 T0 Pre shelter REX soil (Grant)

Acid washed dishes, prepared standards.

Lachat run 6_21_2023-and-6_23_2023_T0_Pre_Shelter_REX_N-Min soil (Grant)

Prepared 1M KCL

Reconditioned Cadmium Column, Lachat run 2022_07_28_08_01_Peak-drought_REX_N-min (Grant)

Prepared Standards.

Prepared Color Reagent (2 L) 200 ml phosphoric acid 80 gm sulfanilamide, 2.0 gm N-1-naphthylethylenediamine dihydrochloride, Dilute to 2L with Nanopure H2O.

Did a Rerun of Channel 2 NO3 for LTER soil 07052023 with new standards due to many near zero negative results. Samples still negative, b value of calibration curve -0.0317.

Reconditioned Column. Lachat run LTER soil 07052023.

Prepared fresh Phosphate Buffer (1L) 28 gms Sodium Hydroxide pellets 50 gms sodium phosphate dibasic heptahydrate dilute to 1 L with nanopure.

Prepared EDTA Reagent (1L) 66 gms ethylenediamine tetraacetic acid disodium salt dihydrate (EDTA) Approximately 7.0 gms sodium hydroxide pellets ph to 7.03 with NaOH pellets then dilute to volume with nanopure.

Acid washed dishes.

Prepared Ammonium Chloride Reagent (4L): 320 gms Ammonium Chloride 4.0 gms EDTA pH to 8.45 with NaOH, store.

Lachat run LTER Soil 06202023.

Prepared Color Reagent (2 L) 200 ml phosphoric acid 80 gm sulfanilamide, 2.0 gm N-1-naphthylethylenediamine dihydrochloride, Dilute to 2L with Nanopure H2O.

Lachat run LTER soil T4 5/30/23.