Envco – Environmental Equipment

With the CHEMetrics tests, ferrous iron reacts with 1,10-phenanthroline to form an orange-colored chelate. To determine total iron, thioglycolic acid solution is added to reduce ferric iron to the ferrous state. The reagent formulation compensates for interference from oxidizing agents. Results are expressed as ppm (mg/L) Fe.

Iron (total)
CHEMetrics' colorimetric method for determining total iron uses thioglycolic acid to dissolve particulate iron and to reduce iron from the ferric to the ferrous state. Ferrous iron then reacts with PDTS (3-(2-pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-triazine disodium salt) in acid solution to form a purple-colored chelate. Results are expressed as ppm (mg/L) Fe.

Iron in Brine
Iron contamination in oil field brines are typically a result of corrosion processes of iron-containing metallic components and equipment. Accumulation of insoluble iron salts in a brine completion fluid can result in substantial formation damage and can significantly affect the productivity of an oil well. Quantifying total iron in brine is critical.

The Iron in Brine test method employs the ferric thiocyanate chemistry. In an acidic solution, hydrogen peroxide oxidizes ferrous iron. The resulting ferrric iron reacts with ammonium thiocyanate forming a red-orange colored thiocyanate complex, in direct proportion to the iron concentration.

The method expresses total iron content inunits of mg/L. By simply dividing the measured mg/L by the density of the brine expressed in units of kg/L, the ppm value can be obtained in mg/kg.

The CHEMets Method

To perform a test, immerse the CHEMet ampoule into the sample and snap off the tip (Step 1)- the correct volume of sample is automatically drawn in, filling the ampoule; a small inert gas bubble remains in the ampoule. To facilitate mixing the sample and reagent, tilt the ampoule back and forth so the bubble travels from end to end (Step 2). In 2 minutes or less, quantify the result by comparing the filled ampoule to the appropriate color standard(s) (Step 3). For higher concentrations, the flat comparator is used. For lower concentrations, the round comparator is used. The ampoule is compared with the standards until a color match is found. Kits include 30 ampoules, comparator(s), accessory solution(s) (when necessary), a sample cup, and instructions. Refill packs of 30 ampoules and accessory solutions are available separately. Comparators have a 2-year shelflife. Material Safety Data Sheets are provided in test kits. CHEMets ampoules are designed for maximum simplicity and accuracy. Each glass ampoule is 7 mm in diameter, 100 mm in length, with a tapered, pre-scored tip; reagents are vacuum-sealed inside.

Ordering Information:

Analyte: IRON (total & soluble)
Method: PHENANTHROLINE
Type: CHEMet

K-6010 Iron (total & soluble) 0-1.0 and 1-10 ppm

Analyte: IRON (total & soluble)
Method: PHENANTHROLINE
Type: VACUettes

K-6010D Iron (total & soluble) 0-30 and 30-300 ppm
K-6010A Iron (total & soluble) 0-60 and 60-600 ppm
K-6010B Iron (total & soluble) 0-120 and 120-1200 ppm
K-6010C Iron (total & soluble) 0-1200 and 1200-12,000 ppm

Analyte: IRON (total & ferrous)
Method: PHENANTHROLINE
Type: CHEMet

K-6210 Iron (total & soluble) 0-1.0 and 1-10 ppm

Kits come in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparators, Activator Solution, 25 mL sample cup, instructions, and MSDS.