Fast food premium toys as a significant source of lead and chromium to the environment

The Federal Trade Commission (FTC) describes a premium as any non-food item distributed in connection with a company‟s food products. The history dates back to 1977 when Dick Brams invented the „Happy Meal‟. Developed over two years and debuting in 1979 the first Happy Meal was a circus-wagon-themed box with the standard hamburger or cheeseburger option, as well as French fries, cookies, a soft drink and a toy (Webley, 2010). The first toys were simple, a stencil, eraser, bracelet, puzzle, or spinning top. In 1987 the first licensed Disney toy appeared, since that time hundreds of licensing agreements have spawned a seemingly endless array of collectible toys. Other Fast Food Premiums (FFP) include coupons, game cards, beverage containers and special offers. FFP are now in use by most fast food restaurants around the world. Examples of other fast food franchises in the US include Burger King, Carl‟s Junior, Wendy‟s, Subway, and Hardee‟s. The suitability of using FFP to market food to children has long been an issue (Otten, 2014). According to Time Magazine 1.2 billion Happy Meals were sold worldwide in 2012, that equates to slightly more than 3.2 million Happy Meals sold per day. In the United States, there are about 220 million Happy Meals sold each year, which is about 602,000 Happy Meals per day. Data concerning FFP in general is considered a trade secret and for that reason is difficult to monitor and use for any quantitative analysis. In 2011, Happy Meal and other child meal sales were down by 6%, from 1.3 billion to 1.2 billion orders (Tuttle, 2012). FFP toys are around three inches in height or length and may be static, dynamic (push action), wind-up, or electronic (Figure 1). Released in batches of around 6 to 8 variants per batch, between just one or all FFP toys may have some variety of electronic components or metal spring. Electronic components may be lights, sound, or both; and may or may not include a Printed Wire Board (PWB). FFP toys featuring lights or sound may use a rudimentary spring and lever system to activate them. A PWB generally consists of an epoxy glass board used as a surface to attach components and


INTRODUCTION
The Federal Trade Commission (FTC) describes a premium as any non-food item distributed in connection with a company"s food products.The history dates back to 1977 when Dick Brams invented the "Happy Meal".Developed over two years and debuting in 1979 the first Happy Meal was a circus-wagon-themed box with the standard hamburger or cheeseburger option, as well as French fries, cookies, a soft drink and a toy (Webley, 2010).The first toys were simple, a stencil, eraser, bracelet, puzzle, or spinning top.In 1987 the first licensed Disney toy appeared, since that time hundreds of licensing agreements have spawned a seemingly endless array of collectible toys.Other Fast Food Premiums (FFP) include coupons, game cards, beverage containers and special offers.FFP are now in use by most fast food restaurants around the world.Examples of other fast food franchises in the US include Burger King, Carl"s Junior, Wendy"s, Subway, and Hardee"s.The suitability of using FFP to market food to children has long been an issue (Otten, 2014).
According to Time Magazine 1.2 billion Happy Meals were sold worldwide in 2012, that equates to slightly more than 3.2 million Happy Meals sold per day.In the United States, there are about 220 million Happy Meals sold each year, which is about 602,000 Happy Meals per day.Data concerning FFP in general is considered a trade secret and for that reason is difficult to monitor and use for any quantitative analysis.In 2011, Happy Meal and other child meal sales were down by 6%, from 1.3 billion to 1.2 billion orders (Tuttle, 2012).FFP toys are around three inches in height or length and may be static, dynamic (push action), wind-up, or electronic (Figure 1).Released in batches of around 6 to 8 variants per batch, between just one or all FFP toys may have some variety of electronic components or metal spring.Electronic components may be lights, sound, or both; and may or may not include a Printed Wire Board (PWB).FFP toys featuring lights or sound may use a rudimentary spring and lever system to activate them.
A PWB generally consists of an epoxy glass board used as a surface to attach components and interconnections to form a functioning electronic circuit.Tin/lead solder (63% tin and 67% lead) is the prevalent solder alloy used in PWBs (Nordic Council of Ministers, 1995).Lead is a well-known environmental contaminant with recommended environmental levels established by various governmental bodies throughout the world.These boards are small, typically between 1 and 2 cm 2 , and have attached cell batteries, running either a wired speaker, LED, or sometimes both.Previous work in this area has shown much larger PBWs with between 0.0 and 72.5 mg/L leached from them under the EPA Toxicity Characteristic Leaching Procedure (TCLP).Subsequently, PWBs regularly exceed the lead toxicity characteristic (TC) limit of 5 mg/L in TCLP leachates.Alternative forms of solder are accessible containing mixtures of tin/copper and tin/silver/copper (Townsend et al., 2008).
The earliest consideration of leaching of harmful pollutants from children"s toys (Milana et al., 1993) found "limited danger", the toys were of the period (1990s) and none of the toys investigated were electronic.Conversely, the only widely reported incidence of toxic metals found in FFP toys was the 2010 case of cadmium found in 13.4 million painted Shrek glasses sold by McDonalds (Neuman, 2010).These levels were deemed high enough to illicit concern, but the exact amounts went unreported in the press.Lead and cadmium have long been used as stabilizers in plastic toys (Kumar and Pastore, 2007).More recently toxic metals have been found in a variety of children"s toys and jewelry bought on the North American (Guney and Zagury, 2013) and Turkish market (Charehsaz et al., 2014).Preliminary household and commercial items identified an electronic (TCLP) work done by this laboratory on a variety of FFP toy as a significant source of lead (10,000 times the earlier reports), along with trace amounts of other metals, amount of lead leached from the toys featured in the most notably chromium.Further investigation of FFP toys manufactured during the years 1997 to the present was undertaken in order to ascertain their potential for leaching toxic metals, those results are presented here.Whilst the concentrations measured in this study should not be considered indicative of what will be observed in landfill leachate, the results do provide an insight into potential problems with these toys being discarded into the household waste stream.It is hoped that this data can also be helpful for performing life-cycle assessment (LCA) of FFP.

Leaching procedures
In the United States, the Resource Conservation and Recovery Act (RCRA) of 1976 led to the establishment of federal standards for the disposal of solid waste and hazardous waste.A waste is considered hazardous when it exhibits one or more of the following characteristics: Ignitable, corrosive, reactive, toxic, or listed in the code of federal regulations.RCRA requires that industrial wastes and other wastes must be characterized for toxicity following testing protocols published by the Environmental Protection Agency (EPA).Tostar et al. (2013) describes several variations of leaching tests for inorganic solids, including dilute nitric acid, dilute sodium hydrogen tartrate, and dilute citric acid.Since all of the food premiums were purchased in the United States.We chose to follow the U.S. EPA Test Methods for Evaluating Solid Waste (SW -846) (U.S. Environmental Protection Agency, 1996).TCLP (method 1311) is designed to simulate material sitting in a landfill for a number of years (with an assumption of the acidic conditions found in most landfills), and then "determine the mobility of both organic and inorganic analytes present in liquid, solid, and multiphasic wastes" from the leachate that the material would produce.TCLP is the only leaching procedure specified by regulation for characterizing the hazardous waste toxicity characteristic (40 CFR 261.24: waste codes D004 -D043) under RCRA regulations.Method 1312, the synthetic precipitation leaching procedure (SPLP), is designed to simulate material left in situ (in or on top of the ground surface) exposed to rainfall (with an assumption that the rainfall is slightly acidic) and then "determine the mobility of both organic and inorganic analytes present in liquids, soils, and wastes" from the leachate the material would produce.SPLP is used to determine the leaching potential of soils, waste, and wastewater caused primarily by rainfall (precipitation).Table 1 lists the regulatory thresholds one would utilize to compare against TCLP analytical results.If a solid waste fails the test for one or more of these compounds, the waste is considered to be a characteristic hazardous waste.

EPA SW-846 Method 1311 "Toxicity Characteristic Leaching
Procedure" was the chosen leaching method.Since the procedure calls for the analysis of low-level metal concentration, the utmost caution was taken in order to avoid contamination.All plastic containers and funnels were acid-washed using 5 M trace metal grade Nitric Acid (Fisher Scientific), and triple rinsed with Type II deionized water.
The FFP toys were disassembled and all metallic and electronic components were separated from their plastic shells.These consisted of a mixture of screws, PWB, wires, speakers, LED, and cell batteries.All parts to be analyzed from each premium were weighed in order to assess the amount of TCLP extraction fluid to be added.TCLP solution was made in the appropriate quantity for each batch of 5-6 FFP toys plus TCLP blank sample by adding 5.7 mL laboratory grade glacial acetic acid (Fisher Scientific) to 1 L of deionized water obtaining a solution that was 2.88 ± 0.05 pH.
Sample containers (Nalgene bottles 250 mL, 8 oz) were then filled with the TLCP solution using a ratio of 20:1 volume of TCLP solution to toy FFP component mass.Each batch of samples was then placed on a rotator for a period of eighteen hours.At the end of the eighteen-hour rotation period the samples were removed from the rotator, filtered through a plastic funnel with No. 40 Whatman filter paper into a clean container and placed in the refrigerator.Samples were analyzed within 12 h of processing in order to avoid loss of analyte due to precipitation.
TCLP extracts from each toy FFP sample were measured using a Thermo iCAP 6300 ICP -OES equipped with autosampler and iTEVA software.Standards (SPEX CertiPrep) used for the analysis were Assurance TCLP Standard 1 (Ag, As, Ba, Cd, Cr, Pb, Se) and Assurance TCLP Standard 2 (Hg), and Assurance QC Standard 21. (Pb).Standard dilutions can be shown in Table 2. Standard calibration curves for each element were plotted with this method Analyte concentrations were calculated by subtracting the TCLP blank concentration from the reported ICP-OES values.The Limit of Detection (LoD) was 0.002 mg/L for Ba, 0.04 mg/L for Cd, 0.02 mg/L for Cr, 0.56 mg/L for Hg, and 0.32 mg/L for Pb.The Limit of the Blank (LoB) was 0.001 mg/L for Ba, 0.004 mg/L for Cd, 0.01 mg/L for Cr, 0.53 mg/L for Hg, and 0.3 mg/L for Pb.The response was linear up to 100 mg/L (R 2 analyzed by ICP -OES directly after each treatment was finished).Dilutions were made where necessary.Standard correlation R 2 values of > 0.9 were deemed acceptable.Results were classed as not detected (ND) below the instruments limit of detection.

RESULTS AND DISCUSSION
The results of the TCLP tests of 35 FFP toys are shown in Table 3 and Figure 2.There were 33 FFP toys containing electronics with 6 FFP toys that contained electronics with no PWB, their LED lights being operated via springs and levers.No silver, arsenic, or seleniumwas detected in any of the FFP.Small amounts of mercury were found in some of the samples however since it was below the LoD those results are not reported.The TCLP results found that the two most commonly detected metals were lead and chromium, with trace amounts of barium, and cadmium.Lead was found to leach from PWB at concentrations greater than the RCRA TC limit (5.0 mg/L) for 22 out of the 27 tested FFP toys that contained PWB.The Pb concentration ranged from 0 to 176.8 mg/L with an average of 31.9 mg/L.The largest Pb concentrations were found in the extraction fluid from  The Cr concentration ranged from 0 to 3.7 mg/L with an well below the TC limit (5.0 mg/L).The remaining TC metals defined by RCRA silver, arsenic, mercury, and selenium were not detected in any of the leaching tests.This is likely a consequence of the limit of detection of our instrument and redox chemistry.
As shown in Table 3, no silver was detected in any of the samples.It has been demonstrated elsewhere (Townsend et al., 2008) that the presence of other metals in a sample can influence the relative leachability of a given metal, specifically those with high reduction potentials (Table 4).Although we did not quantify the levels of Fe in the leachate, we suspect that the inclusion of any screws, springs, or assorted metal parts in the leachate study may have prevented any significant amount of silver from being oxidize and detected in the leachate solution.Parts containing iron or having a chrome plating were found in many of the FFP toy samples.It was observed that after conducting the leaching procedure many of the metal components were noticeably oxidized as evidenced by a blackened or discolored surface.

Conclusions
We have shown that FFP toys are a previously unreported and significant source of TC metals lead and chromium to the environment and should be treated as E-Waste, to be disposed of in the appropriate way along with similar electric and electronic devices.In order to attract customers, the complexity of FPP has increased to a point where it is now common for them to include a PWB, LED"s or even a rudimentary LCD display.Our results show 10,000 times the amount of lead than reported in the original "Little Toys" work of Milana et al. (1993), a change resulting of the progression to simple toys to more sophisticated electronic devices.All TCLP lead results for the toys containing PWBs were higher than the permissible EPA level of 5.0 mg/L, up to 35 times the permissible level.Barium, cadmium, chromium, and mercury were also detected at ppb levels.Chromium results were all less than the permissible 5.0 mg/L, but still as high as 3.3 mg/L.
The US EPA"s design for the environmental program has worked with stakeholders to investigate and promote lead-free solders.The European Union Directive 2001/95/EC, Restriction of Hazardous Substances (RoHS) restricts the use of hazardous materials found in electrical and electronic products including the metals cadmium, chromium, lead, and mercury from 2006 onwards.Given that many of these FFP toys were manufactured after the RoHS initiative, the solder used in the PWB was expected to be lead free.The results may indicate that this was not the case.78% (21 of 27) of the electronic FFP toys with PWB showed levels of lead in the leachate samples higher than the regulated levels.In comparison, only one of the six FFP toys without a PWB showed a level of lead higher than the regulated levels.Since lead was not detected in most of the samples without a PWB but was detected in samples containing a PWB, it is expected that the source of the lead is the solder used in the interconnects between components.This solder does not meet RoHS requirements.The source of the chromium is likely from the chrome plating of screws, springs, and wires.As demonstrated by the results of FFP toys that lack a PWB, but instead utilize levers or springs, these have a much lower average concentration of lead but higher average concentration of chromium.
While a majority of the FFP toy samples contained a battery, none of those samples showed elevated levels of mercury.This result is expected for two reasons.Firstly, both Europe and the United States effectively outlawed the used of mercury button cells between 1991 and 1992 it is expected that the battery chemistry would be free of mercury.Secondly, since the battery cells in the FFP toy samples were not mechanically broken open, it is likely that they did not contribute significantly to the leaching results.While the identity of the batteries were not confirmed, it is assumed that they were zinc-air, alkaline, or silver cells with the former being the least likely due to its discharge characteristics.However, over time the batteries contained in FFP toys will corrode to a point where the container will fail and the cathode and anode materials as well as the electrolyte will begin to leach into the environment.Future studies will include a separate analysis of the battery types and leaching properties.
Early and ongoing work on consecutive TCLP leaching tests of FFP toys has shown that there is potential for further leaching at levels exceeding the first leach.Since no account of the total metal content of FFP toys exists it is difficult to assess their potential for contamination.Our calculations suggest that the mass of lead leached from fast food premium toys in a standard 18 h TCLP test ranged between 0 and 55 mg.It is therefore important to report that these FFP toys continue to contain levels of TC metals that exceed the permissible levels and present an ongoing threat to our environment.

Figure 1 .
Figure 1.Examples of fast food premium toys.

Figure 2 .
Figure 2. D-List contaminant metals investigated in this study.†: No circuit board.

Table 1 .
Maximum concentration of D-List contaminants for toxicity characteristic identification.

Table 3 .
The analysis of FFP toys for metals.No amounts of silver, arsenic, and selenium were detected.Samples containing measured Hg are not shown as there were issues with contamination of the TCLP solution.BK -Burger King, McD -McDonalds, AATCTS -Avin and the Chipmunks: The Squeakquel, HTTYD -How to Train Your Dragon.