I have four years of experience working in quality control laboratories on a wide variety of analytical instrumentation. I have worked in the hazmat, semiconductor, pharmanatural/nutraceutical, and cannabis industries. I specialize in trace metal analysis by ICP-MS. I have worked with Agilent 7500, 7700, 7900, 8800, and 8900 ICP-MS instruments, as well as the PerkinElmer NexION 1000. I am also adept at the microwave digestion process, and have used both Milestone SRC and Mars rotor microwave systems.
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Laboratory ManagerApollo LabsScottsdale, Az, Us -
ChemistApollo Labs 2021 - PresentScottsdale, Arizona, United States-Primarily tests cannabis samples for arsenic, cadmium, lead, and mercury on an Agilent 7700 ICP-MS.-Utilizes microwave digestion for sample prep (familiar with Milestone SRC and Mars rotor microwaves).-Prepares samples, calibrates instrumentation, and enters/reviews test results.-Performs troubleshooting/maintenance, including changing peristaltic pump tubing, unclogging nebulizers, cleaning cones, changing gas cylinders/dewars, preparing standards, doing dilutions, etc.-Interviews candidates and trains other chemists in trace metals analysis.-Is responsible for all chemical receiving, including managing SDS's and COA's.-Monitors metals results, communicating with clients to pinpoint sources of contamination.-Tests soil, coco, catridges, water sources, pesticides, and more to troubleshoot elevated results.-Developed a low-chloride microwave digestion method to promote cone and detector health.-Is trained to test samples for 14 different cannabinoids by HPLC.
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ChemistFine Living Pharmanaturals Oct 2020 - Jul 2021Tempe, Arizona, United States-Standardized and wrote procedures for organoleptic testing, loss on drying (LOD), and FTIR.-Self-taught operation and maintenance of HPTLC for identification of botanicals and botanical extracts.-Used water activity to assess risk of microbial growth and predict sample stability.-Streamlined sample testing by implementing 5S principles in the lab and helping go paperless.-Performed daily calibration and testing on ICP-MS for the analysis of solid samples utilizing microwave acid digestion.-Tested samples at each stage of production for trace metal contamination as well as mineral content.-Abided by CGMP regulations as enforced by the FDA.
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Laboratory TechnicianMgc Pure Chemicals America, Inc. Mar 2019 - Mar 2020Mesa, Arizona, United States-Tested hydrogen peroxide, ammonium hydroxide, and a hybrid chemical for assay and purity. -Utilized many instruments including HPLC, GFAAS, ICP-MS (at the ppt level), autotitrators, UV-Vis, and TOC. -Calibrated and ran samples on all instruments regularly. -Implemented the 5S system for lean manufacturing in the lab as part of a companywide initiative. -Obtained technical writing experience, authoring two instrument manuals and six SOP’s. -Performed instrument qualification, matching studies, and non-conformance reports. -Worked with a laboratory information management system (LIMS). -Shared information between teams daily to facilitate problem solving and prevent communication gaps. -
Cleanpack ChemistClean Harbors Aug 2018 - Dec 2018Phoenix, Arizona-Identified, sorted, and packed hazardous waste for clients including hospitals, labs, and universities.-Ensured HAZMAT compliance with EPA, DOT, state, local, and site-specific regulations. -Assisted with citywide household hazardous waste collections. -Prepared a job hazard analysis before each lab pack to ensure health and safety. -Received 40-hour HAZWOPER certification. -
TutorSelf-Employed Aug 2015 - May 2018Scottsdale, AzI have tutored one high school student in Physics I and two undergraduate students in General Chemistry.
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Teaching AssistantWheaton College Aug 2014 - May 2018Greater Chicago Area-10 hours/week-Competitive position based on grades and faculty recommendations.-Assisted students in lab by answering questions, troubleshooting instruments, disposing of waste, and enforcing safety protocol.-Grades student quizzes and lab reports weekly.-Courses: General Chemistry (one semester), Inorganic Chemistry (one semester), Organic Chemistry (two semesters), and Physical Chemistry (two semesters). -
Water Treatment InternshipWheaton College Jan 2017 - Dec 2017Greater Chicago Area-40 hours/week-Tested water regularly for conductivity, pH, hardness, alkalinity, chlorine, bromine, phosphate, organophosphonate, iron, and sulfite.-Created digital log sheets in Google Drive, giving the shop remote access to water quality data.-Treated water with corrosion inhibitor via reciprocating pumps as well as filter feeders.-Brought an abandoned system of sock and cartridge filters online, clarifying once-muddy water.-Collaborated with various contractors and helped supervisors evaluate different treatment options.
David Christensen Education Details
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Chemistry
Frequently Asked Questions about David Christensen
What company does David Christensen work for?
David Christensen works for Apollo Labs
What is David Christensen's role at the current company?
David Christensen's current role is Laboratory Manager.
What schools did David Christensen attend?
David Christensen attended Wheaton College.
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