Water Analytical Tests

Cd, Cr, Pb, Ni. This is a combined heavy metals test using acid digestion.

K, Ca, Mg, Na. This is a combined salts test using acid digestion.

Specify Buffer. This is a combined test of multiple water quality factors and includes pH has well.

Al. This test method determines the concentration of aluminum in a water sample by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES).The method has a detection limit of 0.05 mg/L.

NH4-N. This method involves the quantitative analysis of ammonium (NH4-N) and nitrate (NO3-N) in water. Ammonium and nitrate are measured by the diffusion-conductivity method based on the gaseous diffusing of ammonia (NH3) across a gas permeable membrane in the presence of excess base (KOH) and subsequent conductivity detection. The method has detection limit of approximately 0.05 mg/L and is generally reproducible within 7%.

As. This test is for arsenic. Samples are digested using perchloric and sulfuric acids. Values are determined by Inductively-Coupled Plasma Emission Spectrometer (ICP-AES). The method has a detection limit of 0.5 ug/L.

HCO3, CO3. This method measures bicarbonate (HCO3-), carbonate (CO32-) and alkalinity levels in water. Quantitation is by titration with 0.025 N H2SO4. The method has a routine detection limit of 0.1 meq/L but is capable of a method detection limit for alkalinity of 0.04 meq/L (2 mg CaCO3/L) if requested by client.

B. This test method determines the concentration of boron by utilizing an acid digestion and determination by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The method has detection limits ranging from 0.1 mg/Kg. The method is generally reproducible within 8%.

Cd. This test method determines the concentration of cadmium by utilizing an acid digestion and determination by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The method has detection limits ranging from 0.1 mg/Kg. The method is generally reproducible within 8%.

Ca. This test method determines the concentration of calcium by utilizing an acid digestion and determination by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The method has detection limits ranging from 0.1 mg/Kg. The method is generally reproducible within 8%.

Cl. This method quantifies the concentration of chloride in the solution. Plant tolerance to chloride can be related to its concentration in irrigation water. The method detection limit is approximately 0.1 mmolc/L dependent on the method of analysis and is generally reproducible within ± 10%.

Cr. This test method determines the concentration of chromium by utilizing an acid digestion and determination by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES). The method has detection limits ranging from 0.1 mg/Kg. The method is generally reproducible within 8%.

Cu. This test method determines the concentration of copper by utilizing an acid digestion and determination by atomic absorption spectrometry (AAS). The method has detection limits ranging from 0.1 mg/Kg. The method is generally reproducible within 8%.

ECw. This method quantifies the amount of dissolved salts by measurement of the electrical conductivity (ECe ) of the water solution. Salt tolerance crop data is generally expressed in terms of the (ECe ) and used to assess the potential of soluble salts which may limit crop productivity. The method detection limit is approximately 0.01 dS/m and is generally reproducible within ± 7%.

Fe. This test method determines the concentration of iron in a water sample by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES).The method has a detection limit of 0.01 mg/L.