products, news and tips:
February 2010 |
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News from the Lab
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New! IV 2010 - 2011 Catalog
Now Available
We're excited to introduce our new 2010-2011 catalog of inorganic certified reference materials. Our new catalog includes standards for ICP, ICP-MS, IC, AA, and wet chemistry applications.
Standards are colour-coded by application and indexed by catalog number and subject for easy reference. Includes more than 70 new products and more competitive pricing for most ion chromatography standards!
Reserve your copy of the IV 2010 catalog HERE
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Analytical Quick Tip
Perform volumetric pipette solution transfer at room temperature. Aqueous standard solutions stored at 'lower' temperature will have a higher density. Weight solution transfers avoid this problem provided the density of the standard solution is known or the concentrations units are in wt./wt. rather than wt./volume.
Choosing the Right Plastic
Whenever possible, the analyst should
attempt to use plastics for sample collection, storage, preparation, and
measurement. Their major disadvantage is the inability to be used for
high temperature operations, such as ashing or fusion. The table below
shows a summary of the physical properties of some common plastics.
Physical
Properties of Common Plastics
FEP (FLUORINATEDETHYLENEPROPYLENE)
PFA (PERFLUOROALKOXY)
FLEP (FLUORINATED HIGH-DENSITY POLYETHLYENE)
PMP (POLYMETHYLPENTENE)
PP (POLYPROPYLENE)
HDPE (HIGH-DENSITY POLYETHYLENE)
LDPE (LOW-DENSITY POLYETHYLENE)
The most popular plastics are PFA
and HDPE/LDPE.
PFA has excellent properties,
allowing for use in acid digestions up to 250 °C. Typically, PFA is used
for acid digestions using either HF, HNO3 or HCl, alone or
in combination. The use of higher boiling acids such as H2SO4
and H3PO4 have been reported in PFA, but great
care must be taken not to exceed the 250 °C maximum operating
temperature. PFA is commonly used in the construction of microwave
digestion vessels. Microwave digestions using the higher boiling acids
should not be attempted. Digestions using HCLO4 should never
be performed in plastics of any kind.
LDPE or HDPE bottles
are typically used for containment of the sample digestate after
dilution with water. These bottles can withstand solutions of HNO3
that are 10% v/v and lower over extended periods of time (i.e. -
years). The caps used for the LDPE and HDPE bottles are made of PP,
which is more rigid than the polyethylene and well-suited for its
purpose. Unfortunately, the PP cap is not as clean as the PE bottle.
The above passage was taken from Reliable Measurements:
Container Material Properties. Read the full guide here.
Analytical
Tips For Tin
Dr. Gaines suggests the best lines for
interference-free tin analyses.
Analyzing
Silicone Oils
Dr. Gaines offers advice and preparation tips
for the analysis of silicone oils.
ICP Operations Guide (complete)
A
clear 16-part online guide intended for anyone preparing samples and
standards for measurement using ICP. Topics cover many day-to-day tasks
required by all operators.
Reliable Measurements: A Guidebook for Trace Analysts (complete)
An
essential 17-part online guide for chemical analysts. Topics cover all
phases of sample collection, preparation, measurement, and data
analysis.
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Inorganic Ventures is a chemical Certified Reference Material (CRM) producer that specializes in preparing custom inorganic standard solutions designed for a variety of applications. These include ICP, ICP-MS, Ion Chromatography, and Atomic Absorption. Additionally, they produce a wide selection of QC water standards, as well as reference materials for wet chemical applications.
For almost a decade, Inorganic Ventures has been fully registered to ISO 9001:2000, ISO/IEC 17025, and ISO/IEC Guide 34. These key international accreditations have helped Inorganic Ventures to excel in both the caliber of their products and the quality of their customer service.
Leading the industry
- 1st to perform trace metals analysis on final products.
- 1st to calculate a Certified Value based on two independent assays to two different NIST SRMs.
- 1st to use LDPE plastic bottles for packaging to maintain product purity.
- 1st chemical solutions manufacturer to be accredited to ISO Guide 34-2000.
- 1st and ONLY CRM manufacturer to offer a 100% Satisfaction Guarantee.
Inorganic Ventures is situated in a state-of-the-art laboratory located in Christiansburg, Virginia, USA. Inorganic Ventures' manufacturing laboratory is designed to be contamination-free during every stage of production.
Most foreign orders are shipped from their European distribution center in Madrid, Spain.
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| Product Showcase |
Low Level Standards - Inorganic Ventures offers an extensive line of 10 part-per-million (PPM) and 100 PPM standards. These reference materials are conveniently shipped the day they're ordered. Additionally, custom multi-element blends are available upon request, at levels as low as the part-per-billion range. View products »
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| Element
of the Month |
Tin
Storage & Handling: Keep tightly sealed when not
in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not
return portions removed for pipetting to container.
Chemical Compatibility: Soluble in HCl and dilute HF /
HNO 3. Avoid neutral to basic media. Unstable at ppm levels
with metals that would pull F - away (i.e. - do not mix with
Alkaline or Rare Earths or high levels of transition elements unless
they are fluorinated). Stable with most inorganic anions, provided it is
in the following chemical form: Sn(OH) xF y2-.
Stability: 2-100 ppb levels stable (alone or mixed
with all other metals that are at comparable levels) as the Sn(OH) xF y2-
for 1 year in 1% HNO 3 / LDPE container. 1-10,000 ppm single
element solutions as the Sn(OH) xF y2-
are chemically stable for years in 2-5% HNO 3 / trace HF in a
LDPE container.
Sn Containing Samples (Preparation & Solution):
Metal (soluble in HF / HNO 3 or HCl); Oxides - SnO (soluble in
HCl), SnO 2 - very resistant to all acids including HF
(fusion with equal parts of Na 2CO 3 and S is
soluble in water or dilute acids as the thiostannate); Alloys (treat
first 0.1 g with 10 mL conc. H 2SO 4 to boiling
until the alloy disintegrates and nearly all of the sulfuric acid is
expelled. Then add 100 mL O 2 free water and 50 mL of conc HCl
or transfer to a plastic container and add 1 mL HF, in either case,
warming gently to bring about solution); Organic Matrices (volatility
and precipitation of the insoluble stannic oxide are problems -- because
these preparations are prone to error, we recommend you contact our
technical staff at sales@esslab.com
and we'll provide you with the necessary data for
your specific sample type).
Excerpt from
Inorganic Venture's Analytical
Periodic Table: Includes detailed analytical data for more than 70
elements.
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Inorganic Ventures flexes to my specs by providing quality products
time and time again. The quality of their service is also exceptional.
There's always a "live" person when you call (very important!) and I
always get a response to my inquiries either by phone or e-mail. With
your level of quality in products and service, I think you've become the
NORDSTROM of the "Standards" industry.
— Sally Gemora -
Hayward, CA
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