SSHCZO -- Groundwater Chemistry, Stream Water Chemistry -- Shale Hills -- (2015-2015)

To quantify “truly dissolve” phases of solute concentrations, groundwater and stream water samples collected at the Shale Hills Critical Zone observatory were filtered a sequence of filters with different pore sizes (1μm, 0.45 μm, 0.22 μm, 100KDa, and sometimes 1 KDa). Approximately 1L of water samples were taken at the Shale Hills CZO. The samples were retrieved to the laboratory within an hour and were filtered at the laboratory. The samples were filtered:

Filter pore size filter material filter manufacture filtration method

1μm Cellulose nitrate membrane filters Whatman vacuum filtration

0.45 μm Polyethersulfone membrane filter Pall Corporation vacuum filtration

0.22 μm Polyethersulfone membrane filter Pall Corporation vacuum filtration

100KDa Regenerated Cellulose filter EMD Millipore ultra-filtration

1KDa Regenerated Cellulose filter EMD Millipore ultra-filtration

The filtrates were acidified (1% v/v) using Optima Nitric acid. Major cations and silica were analyzed on an inductively coupled plasma–optical emission spectrometer (ICP– OES).

为量化溶质浓度的“真正溶解”阶段，于页岩山关键带观测站采集的地下水和溪流水样经过一系列不同孔径的过滤器（1μm、0.45 μm、0.22 μm、100KDa，有时为1 KDa）进行过滤。在页岩山关键带观测站采集了约1升的水样。样品在采集后一小时之内被带回实验室，并在实验室中进行过滤。过滤过程如下：